System Sensor DNR Intelligent Non-Relay Duct Smoke Detector

The System Sensor DNR intelligent non-relay duct smoke detector is an addressable, photoelectric smoke detector designed for HVAC ductwork within fire detection and life-safety systems. It is commonly installed in air handling units, ventilation ducts, commercial buildings, and industrial facilities to detect smoke in ductwork and help control fan shutdown through an addressable signaling line circuit (SLC). Key specifications include the InnovairFlex series, non-relay configuration, and communication via SLC, with a wide air-velocity range of 100 to 4,000 ft/min (0.5 to 20.3 m/s) and operating temperature from -4°F to 158°F (-20°C to 70°C) and 0% to 95% non-condensing humidity; mounting supports rectangular or square duct installations. Maintenance teams and system integrators use this part for repair, retrofit, expansion, and replacement within HVAC smoke detection and fire protection networks, and common replacements include System Sensor DNRW, DH100ACDC, and Notifier FSD-751P.