Common causes include a clogged furnace filter

Broad Application: Suitable for a variety of non-corrosive gas services

The compact straight-through body pattern and 1/4" male quick-connect terminals allow for streamlined installation in tight cabinet spaces

Industrial Durability: The NEMA 4X watertight and corrosion-resistant enclosure is suitable for harsh environments

System Sensor D4120W Detector Freon Common causes include a cloggedThe System Sensor D4120W is a high performance 4 wire photoelectric duct smoke detector specifically engineered for harsh environments and outdoor rooftop HVAC installations. This air duct smoke detector features a NEMA 4 watertight enclosure, providing superior protection against windblown dust, rain, and splashing water. Utilizing integrated low flow technology, the unit operates efficiently in airflow speeds ranging from 100 to 4,000 feet per