D342 Series: Four-Wire Duct Smoke Detectors

The D342 Duct smoke housings mount on the ducts of heating, ventilation, and air conditioning (HVAC) systems. The detectors in the housings monitor the presence of smoke in the conditioned air. The housing works with all 24 V(AC or DC), 220 VAC, or 240 VAC UL Listed four‐wire control panels.
The efficient housing design samples the air passing through a duct and detects potentially hazardous conditions. When smoke is detected, the detector sends an alarm signal to the control panel or HVAC control equipment. The control panel or HVAC control equipment initiates the necessary action to control air handling systems.