System Sensor D4120

The System Sensor D4120 is a 4-wire photoelectric duct smoke detector from the InnovairFlex series, designed to detect smoke in HVAC ducts under challenging conditions. It operates effectively in airflows ranging from 100 to 4,000 feet per minute, temperatures between –4°F and 158°F, and humidity levels from 0% to 95% non-condensing. Key Features: • Versatile Mounting: The detector’s pivoting housing fits both square and rectangular footprints and can be mounted to round or rectangular ductwork. • Plug-In Sensor Design: Features a plug-in sensor head for improved false alarm immunity and simplified installation, testing, and maintenance. • Tool-Free Sampling Tube Installation: Patented sampling tubes can be installed from the front or back of the detector without the need for tools. • Enhanced Wiring Space: Provides increased wiring space with a ¾-inch conduit knockout for easier installation. • Integrated Test/Reset Button: Includes an easy-access Test/Reset button and impro