System Sensor D4120W Duct Smoke Detector Photoelectric 24VAC/DC 120V NEMA IV

The System Sensor D4120W Nema IV Photoelectric Smoke Detector is a heavy-duty smoke detector designed for harsh environments found in commercial and industrial buildings. It uses a photoelectric chamber to detect smoke particles in the air. When smoke is present, the detector sounds an alarm, alerting occupants to a potential fire. Its durable construction (weighing 3.09 lbs) and wide operating range (-4°F to 158°F) make it suitable for rooftop HVAC units and other exposed locations. The D4120W operates on a broad voltage range (24V to 120V) for compatibility with most existing electrical systems. Its NEMA IV rating ensures protection against dirt, rain, windblown dust, splashing water, and even hose-directed water.