InnovairFlex 2-wire photoelectric duct smoke detectors feature a pivoting housing that fits various applications. Both square and rectangular footprints mount to round or rectangular duct work. These new duct smoke detectors sense airflow at speeds ranging from 100 to 4,000 Feet/Minute with proven System Sensor precision. The design provides more wiring space with an added 3/4 Inch conduit knockout. Numbers and labels for terminal designations are consistent with previous Innovair models. The new sampling tube can be clicked into position with one smooth motion from either the front or the back of the detector. The InnovairFlex D2 duct smoke detector has signals to indicate trouble and maintenance conditions. Additionally, a cover tamper feature is incorporated to indicate a trouble condition for a removed or improperly installed sensor cover. An improved cover design, with an integrated low-flow feature, isolates the sensor head from the low-flow technology for simple maintenance. The InnovairFlex series is designed for greater flexibility and reliable smoke detection to simplify installation and maintenance. The InnovairFlex product line is backward compatible to existing Innovair models, including remote test accessories.