Smoke Duct Detector D4120 DH100ACDCI

h3.Standard Features * 4-wire low-profile duct smoke detector * UL, California State Fire Marshall and FM approved * Outside mounting tabs * Telescoping plastic sampling tube covers up to 24" duct * Built-in reset button * Interconnectability for multi-fan shutdown (up to ten air handlers) * 24 VAC/DC or 120/240 VAC operation * Cover tamper trouble signal * Easy mounting to round or rectangular ducts from 1' to 12' wide * Textured cover for convenient visual inspection * 3 year warranty h3.Models * D4120 - 4-wire Photoelectric h3.Options * Metal sampling tubes (by duct width): 1-2', 2-4', 4-8', 8-12' * Remote test station with key lock * Remote annunciator alarm LED * Piezo annunciator with power and alarm LED * Low-profile sensor head * Multi-signaling accessory * Mini-Alert sounder * Mini-Alert add-on strobe