The SD505-DUCT addressable duct smoke detector including the SD505-APS
Photoelectric Smoke Sensor is used for detecting smoke and products of
combustion present in air moving through HVAC air handling system. When smoke is
detected in a duct, the unit communicates the condition to the IntelliKnight
control panel. The panel, in turn, depending on programming and wiring, turns
off fans, blowers, and other devices. Now there's even more power and
flexibility available to the IntelliKnight family of products.