{"title":"3550 Series - Vertical Mount Backdraft Damper","description":"\u003cp\u003e\u003cstrong\u003eStandard Features\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli\u003eBlades run parallel to first dimension given Square steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli\u003eAdjustable counter balance arms mounted to center of blades.\u003c\/li\u003e\n\u003cli\u003eAdjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.) \u003c\/li\u003e\n\u003cli\u003eMinimum size 6\"x6\" Maximum size 48\"x48\" Fractional and exact sizes available\u003c\/li\u003e\n\u003cli\u003eNote: Order Wide x High Galvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","products":[{"product_id":"backdraft-vertical-mount-3550-10x10","title":"3550 Series - Vertical Mount Backdraft Damper-10X10","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458277855301,"sku":"211512","price":196.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_40e859a6-0cb4-484e-b0e6-46d62ba6dce9.jpg?v=1790448929"},{"product_id":"backdraft-vertical-mount-3550-12x12","title":"3550 Series - Vertical Mount Backdraft Damper-12X12","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458280411205,"sku":"211513","price":196.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_8f8e9b37-cb24-4054-a7f4-5f7620f2ad57.jpg?v=1790448927"},{"product_id":"backdraft-vertical-mount-3550-12x30","title":"3550 Series - Vertical Mount Backdraft Damper-12X30","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458285457477,"sku":"211514","price":437.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_f5d0b7a2-7651-4285-896a-58d1c6ee9fe0.jpg?v=1790448926"},{"product_id":"backdraft-vertical-mount-3550-12x36","title":"3550 Series - Vertical Mount Backdraft Damper-12X36","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458289324101,"sku":"211515","price":569.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_39a8047b-fb6f-46ce-acb8-8f27d015d591.jpg?v=1790448925"},{"product_id":"backdraft-vertical-mount-3550-14x14","title":"3550 Series - Vertical Mount Backdraft Damper-14X14","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458292797509,"sku":"211516","price":217.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_c0a85f83-bc65-4324-aae2-4e7dc211164b.jpg?v=1790448924"},{"product_id":"backdraft-vertical-mount-3550-14x30","title":"3550 Series - Vertical Mount Backdraft Damper-14X30","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458300366917,"sku":"211517","price":481.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_9f1a99c6-96da-46ff-a6b1-efd6ee244f85.jpg?v=1790448923"},{"product_id":"backdraft-vertical-mount-3550-14x36","title":"3550 Series - Vertical Mount Backdraft Damper-14X36","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458305839173,"sku":"211518","price":633.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_73635e6c-6442-4c0b-af54-3a2c9bbc2626.jpg?v=1790448922"},{"product_id":"backdraft-vertical-mount-3550-16x16","title":"3550 Series - Vertical Mount Backdraft Damper-16X16","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458315440197,"sku":"211519","price":242.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_68f4ccd2-4bf1-4d91-9a09-2cde14a1080b.jpg?v=1790448921"},{"product_id":"backdraft-vertical-mount-3550-16x25","title":"3550 Series - Vertical Mount Backdraft Damper-16X25","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458319110213,"sku":"211520","price":480.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_edaa9d8b-5b24-43b4-b732-c2fb59cd2ae4.jpg?v=1790448921"},{"product_id":"backdraft-vertical-mount-3550-16x30","title":"3550 Series - Vertical Mount Backdraft Damper-16X30","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458320945221,"sku":"211521","price":504.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_1eb3677d-9060-4007-a74f-7c55f58c7163.jpg?v=1790448919"},{"product_id":"backdraft-vertical-mount-3550-16x36","title":"3550 Series - Vertical Mount Backdraft Damper-16X36","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458327171141,"sku":"211522","price":656.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_f5a044d3-ff6a-47e8-8905-13c6779203a9.jpg?v=1790448919"},{"product_id":"backdraft-vertical-mount-3550-16x44","title":"3550 Series - Vertical Mount Backdraft Damper-16X44","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458330873925,"sku":"211523","price":873.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_634f9751-693d-4a9e-a433-4a32771e895c.jpg?v=1790448918"},{"product_id":"backdraft-vertical-mount-3550-18x18","title":"3550 Series - Vertical Mount Backdraft Damper-18X18","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458336968773,"sku":"211524","price":306.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_d787e367-e47c-4f2d-a924-790835367329.jpg?v=1790448917"},{"product_id":"backdraft-vertical-mount-3550-18x30","title":"3550 Series - Vertical Mount Backdraft Damper-18X30","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458340376645,"sku":"211525","price":547.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_a43bfd11-1ef3-433d-967c-f121ec716107.jpg?v=1790448916"},{"product_id":"backdraft-vertical-mount-3550-18x36","title":"3550 Series - Vertical Mount Backdraft Damper-18X36","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458346504261,"sku":"211526","price":700.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_b35912dc-7d7f-4465-8148-f94c8e44ae26.jpg?v=1790448915"},{"product_id":"backdraft-vertical-mount-3550-18x6","title":"3550 Series - Vertical Mount Backdraft Damper-18X6","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458350141509,"sku":"211527","price":196.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_e772971d-753f-4e33-a8ee-d5118073577b.jpg?v=1790448914"},{"product_id":"backdraft-vertical-mount-3550-20x20","title":"3550 Series - Vertical Mount Backdraft Damper-20X20","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458354860101,"sku":"211528","price":373.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_0c5f3c61-585f-49e2-af5c-b7590ca0b23b.jpg?v=1790448913"},{"product_id":"backdraft-vertical-mount-3550-20x25","title":"3550 Series - Vertical Mount Backdraft Damper-20X25","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458358136901,"sku":"211529","price":587.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_6ea1ce86-dc84-4661-9959-295be68b4fb0.jpg?v=1790448911"},{"product_id":"backdraft-vertical-mount-3550-20x30","title":"3550 Series - Vertical Mount Backdraft Damper-20X30","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458365706309,"sku":"211530","price":588.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_ac258af6-20b4-4501-826f-abab9a4b3d49.jpg?v=1790448911"},{"product_id":"backdraft-vertical-mount-3550-20x36","title":"3550 Series - Vertical Mount Backdraft Damper-20X36","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458371833925,"sku":"211531","price":743.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_f38ee293-05e8-489e-8a6e-ca93170839a9.jpg?v=1790448910"},{"product_id":"backdraft-vertical-mount-3550-20x60","title":"3550 Series - Vertical Mount Backdraft Damper-20X60","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458380156997,"sku":"211532","price":1175.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_9d71a7b6-8f61-4f22-8d6e-eb2bf9c1dd7e.jpg?v=1790448909"},{"product_id":"backdraft-vertical-mount-3550-24x24","title":"3550 Series - Vertical Mount Backdraft Damper-24X24","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458383401029,"sku":"211533","price":547.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_eee97c6e-eafe-4df2-83fb-1f2f7b6c4c99.jpg?v=1790448908"},{"product_id":"backdraft-vertical-mount-3550-24x26","title":"3550 Series - Vertical Mount Backdraft Damper-24X26","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458389397573,"sku":"211534","price":588.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_fd81e71a-3819-430c-91d9-7fca1c680aca.jpg?v=1790448907"},{"product_id":"backdraft-vertical-mount-3550-24x28","title":"3550 Series - Vertical Mount Backdraft Damper-24X28","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458395426885,"sku":"211535","price":633.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_fb1b164d-dcf3-40fa-99ff-77c5ec8997a3.jpg?v=1790448906"},{"product_id":"backdraft-vertical-mount-3550-24x30","title":"3550 Series - Vertical Mount Backdraft Damper-24X30","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458398310469,"sku":"211536","price":656.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_0c4cef77-59af-40e3-aabf-465e00029e07.jpg?v=1790448904"},{"product_id":"backdraft-vertical-mount-3550-24x32","title":"3550 Series - Vertical Mount Backdraft Damper-24X32","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458404732997,"sku":"211537","price":720.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_be68a65c-c8ce-4232-b9b8-fb6228a77a53.jpg?v=1790448904"},{"product_id":"backdraft-vertical-mount-3550-24x34","title":"3550 Series - Vertical Mount Backdraft Damper-24X34","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458409484357,"sku":"211538","price":787.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_08c04a3a-c207-4cad-9f82-c840084b2f7f.jpg?v=1790448902"},{"product_id":"backdraft-vertical-mount-3550-24x36","title":"3550 Series - Vertical Mount Backdraft Damper-24X36","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458412990533,"sku":"211539","price":851.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_318b65ca-001b-4130-802c-7398dae47c55.jpg?v=1790448902"},{"product_id":"backdraft-vertical-mount-3550-26x10","title":"3550 Series - Vertical Mount Backdraft Damper-26X10","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458422034501,"sku":"211540","price":329.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_a75b64b0-2563-468d-9bf3-706955fdb5bc.jpg?v=1790448900"},{"product_id":"backdraft-vertical-mount-3550-26x12","title":"3550 Series - Vertical Mount Backdraft Damper-26X12","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458426589253,"sku":"211541","price":373.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_622fef00-f70a-4938-b7bf-b786e70c8d13.jpg?v=1790448900"},{"product_id":"backdraft-vertical-mount-3550-26x14","title":"3550 Series - Vertical Mount Backdraft Damper-26X14","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458429767749,"sku":"211542","price":416.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_7a1e02e6-e058-41cb-84e0-acd7521f978a.jpg?v=1790448899"},{"product_id":"backdraft-vertical-mount-3550-26x16","title":"3550 Series - Vertical Mount Backdraft Damper-26X16","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458435240005,"sku":"211543","price":437.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_79699bc0-996c-4ed2-a57d-0e1aa8624d53.jpg?v=1790448898"},{"product_id":"backdraft-vertical-mount-3550-26x18","title":"3550 Series - Vertical Mount Backdraft Damper-26X18","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458441171013,"sku":"211544","price":481.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_637f4de5-4cc9-4f16-8405-5662539f999d.jpg?v=1790448896"},{"product_id":"backdraft-vertical-mount-3550-26x20","title":"3550 Series - Vertical Mount Backdraft Damper-26X20","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458445922373,"sku":"211545","price":524.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_36b21caf-8f5c-4244-86f5-0c0b2ad37fe5.jpg?v=1790448896"},{"product_id":"backdraft-vertical-mount-3550-26x22","title":"3550 Series - Vertical Mount Backdraft Damper-26X22","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458452148293,"sku":"211546","price":569.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_d1eb28eb-3163-48d9-8211-8c912bc57d00.jpg?v=1790448894"},{"product_id":"backdraft-vertical-mount-3550-26x24","title":"3550 Series - Vertical Mount Backdraft Damper-26X24","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458455720005,"sku":"211547","price":588.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_16b27bb7-8a58-49af-a2b9-a895cdf18f9d.jpg?v=1790448894"},{"product_id":"backdraft-vertical-mount-3550-26x26","title":"3550 Series - Vertical Mount Backdraft Damper-26X26","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458459816005,"sku":"211548","price":633.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_e00ef853-88df-4517-81f9-95bbb0a5fdc7.jpg?v=1790448892"},{"product_id":"backdraft-vertical-mount-3550-26x28","title":"3550 Series - Vertical Mount Backdraft Damper-26X28","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458463912005,"sku":"211549","price":656.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_2934c7b6-b467-445f-ae00-b8081788d408.jpg?v=1790448892"},{"product_id":"backdraft-vertical-mount-3550-26x30","title":"3550 Series - Vertical Mount Backdraft Damper-26X30","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458467516485,"sku":"211550","price":700.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_5f09c49a-623d-4323-8ffc-9ba46699791b.jpg?v=1790448890"},{"product_id":"backdraft-vertical-mount-3550-26x32","title":"3550 Series - Vertical Mount Backdraft Damper-26X32","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458476494917,"sku":"211551","price":764.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_8ec2bb89-6b83-433c-96d3-6fc905b3d250.jpg?v=1790448890"},{"product_id":"backdraft-vertical-mount-3550-26x34","title":"3550 Series - Vertical Mount Backdraft Damper-26X34","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458479640645,"sku":"211552","price":851.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_3c004214-36d9-4080-8a7c-4117e346ed6a.jpg?v=1790448888"},{"product_id":"backdraft-vertical-mount-3550-26x36","title":"3550 Series - Vertical Mount Backdraft Damper-26X36","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458486292549,"sku":"211553","price":915.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_819570bb-b12c-4a48-b771-b54e75823b75.jpg?v=1790448888"},{"product_id":"backdraft-vertical-mount-3550-28x10","title":"3550 Series - Vertical Mount Backdraft Damper-28X10","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458493141061,"sku":"211554","price":373.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_27415dff-c3cb-49ae-9153-beca45bbf254.jpg?v=1790448886"},{"product_id":"backdraft-vertical-mount-3550-28x12","title":"3550 Series - Vertical Mount Backdraft Damper-28X12","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458496254021,"sku":"211555","price":393.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_4485fd98-0cb4-4729-bcc0-c5933aa401fe.jpg?v=1790448886"},{"product_id":"backdraft-vertical-mount-3550-28x14","title":"3550 Series - Vertical Mount Backdraft Damper-28X14","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458508378181,"sku":"211556","price":437.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_910cb079-e33b-454e-a2ba-e3ac5596e2e7.jpg?v=1790448884"},{"product_id":"backdraft-vertical-mount-3550-28x16","title":"3550 Series - Vertical Mount Backdraft Damper-28X16","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458510966853,"sku":"211557","price":481.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_bfee3a81-8803-4dc4-a29e-0c4a918cc7c3.jpg?v=1790448884"},{"product_id":"backdraft-vertical-mount-3550-28x18","title":"3550 Series - Vertical Mount Backdraft Damper-28X18","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458516996165,"sku":"211558","price":524.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_9971157e-4e2c-4865-b314-e0f65afbb69a.jpg?v=1790448883"},{"product_id":"backdraft-vertical-mount-3550-28x20","title":"3550 Series - Vertical Mount Backdraft Damper-28X20","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458524598341,"sku":"211559","price":547.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_6fb15207-b7ca-4314-b49e-f03ae15ca215.jpg?v=1790448882"},{"product_id":"backdraft-vertical-mount-3550-28x24","title":"3550 Series - Vertical Mount Backdraft Damper-28X24","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458528333893,"sku":"211560","price":633.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_d4639541-d723-47d4-ae7f-97207c85faea.jpg?v=1790448881"},{"product_id":"backdraft-vertical-mount-3550-28x28","title":"3550 Series - Vertical Mount Backdraft Damper-28X28","description":"\u003cdiv\u003e\u003cfont color=\"#555555\" face=\"Lato, Open Sans, Helvetica Neue, Helvetica, Arial, sans-serif\"\u003e\u003cspan style=\"font-size: 16px;\"\u003eStandard Features\u003c\/span\u003e\u003c\/font\u003e\u003c\/div\u003e\u003cdiv\u003e\u003cbr\u003e\u003c\/div\u003e\u003cul class=\"a\" style='margin-top: 0rem; margin-bottom: 2.5rem; color: rgb(85, 85, 85); font-family: Lato, \"Open Sans\", \"Helvetica Neue\", Helvetica, Arial, sans-serif; font-size: 16px;'\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eDampers are opened by air pressure differential and closed by gravity\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003e16 gauge channel frame\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized blades are 26 gauge and vee stiffened for extra strength and stability\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eOut of airstream linkage\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSingle blades on dampers with a height of 10\" or less\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eBlades run parallel to first dimension given\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eSquare steel pivot pins in nylon bushings\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFoam tape sealed blade edges to dampen noise\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eAdjustable counter balance arms mounted to center of blades. Adjustable weights can be positioned along arm for various opening pressures. (Available only on dampers with multiple blades.)\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMinimum size 6\"x6\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eMaximum size 48\"x48\"\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eFractional and exact sizes available\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eNote: Order Wide x High\u003c\/li\u003e\n\u003cli style=\"margin-top: 0rem; margin-bottom: 1rem;\"\u003eGalvanized Finish\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"vendor-unknown","offers":[{"title":"Default Title","offer_id":14458530988101,"sku":"211561","price":700.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/files\/3550_123c03b3-5fdc-4a45-87ce-707fe0b5f7a0.jpg?v=1790448881"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0028\/7509\/7157\/collections\/3550.jpg?v=1790447181","url":"https:\/\/www.registers-direct.com\/collections\/bulk-product-image-uploader.oembed","provider":"Registers-Direct","version":"1.0","type":"link"}