![4 1/4" Vertical Mount Fire Damper 2633-48X30](http://www.registers-direct.com/cdn/shop/products/7d6b82ac7d9b973ed38ae2c45c8916f2_a653285f-1d03-44e0-9703-4009b46b5088_{width}x.jpg?v=1537520242)
4 1/4" Vertical Mount Fire Damper 2633-48X30
h3.Standard Features * 2633 - Square or rectangular out-of-airstream fire damper for vertical mount only. * 2634 - Square or rectangular Spring actuated (6) out-of-airstream fire damper for horizontal or vertical mount. * UL and California State Fire Marshall approved * 4-1/4" standard frame style * Maximum dimension 60w, 52h * Interlocking steel roll-formed blade (3) with roll-formed frames (1) * Blade lock (5) * Damper manufactured from corrosion tested galvanized mild steel (G-90) * Self locking corner (4) * 165° replaceable fusible link (2) h3.Options * Sleeve variations * 304 stainless steel construction * Fractional and odd sizes available h3.Installation Instructions * UL approved installation instructions