The InnovairFlex D4120 4-wire photoelectric duct smoke detector from System Sensor features a pivoting housing that fits both square and rectangular footprints and mounts to round or rectangular ductwork. This unit senses smoke in the most challenging conditions, operating in airflow speeds of 100 to 4,000 feet per minute, temperatures of -4 deg. F to 158 deg. F, and a humidity range of 0 to 95 percent (non-condensing). For applications that require supply and return detection, InnovairFlex has a 2-to-1 sensor to power board capability using the D4120 and the D4S. This capability eliminates the need to run power to a second power board for these applications, reducing installation time and costs. It also reduces maintenance and testing costs by enabling the testing of two sensors from a single location.

System Sensor  www.systemsensor.com/flex