System Sensor D4120W InnovairFlex NEMA 4 Watertight 4-Wire Photoelectric Duct Smoke Detector, 24 VAC/DC or 120 VAC

The D4120W watertight 4-wire photoelectric duct smoke detector is designed for indoor and outdoor applications where environmental protection is essential. Its UL-listed NEMA Type 4 enclosure helps protect against falling dirt, rain, windblown dust, splashing, and hose-directed water.

A pivoting housing supports square or rectangular mounting on round or rectangular ductwork. The detector operates in airflow speeds from 100 to 4,000 ft/min, temperatures from –4°F to 158°F, and humidity from 0% to 95% non-condensing. A plug-in sensor and integrated low-flow technology support reliable smoke detection, while the patented sampling tube installs from the front or back without tools.

Features include a ¾-inch conduit knockout, an easy-access Test/Reset button, and LED status indication. The unit is rated for 24 VAC/DC or 120 VAC.