System Sensor D4120 Duct Smoke Detector

The System Sensor D4120 is a duct smoke detector designed to provide early warning of smoke presence in HVAC ductwork, helping protect air handling systems and maintain safe environments. This detector uses an optical sensing chamber that responds quickly and reliably to smoke particles carried through the duct system. It features a built-in sampling tube to detect smoke efficiently in air ducts and comes with easy installation and maintenance features. The D4120 supports both UL and ULC standards and provides compatibility with many fire alarm control panels. Its robust design ensures accurate smoke detection while minimizing false alarms caused by dust or environmental contaminants. Ideal for commercial and industrial applications, it safeguards HVAC systems by detecting smoke early before it spreads through ventilation.