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The InnovairFlex D4120 4-wire photoelectric duct smoke detector features a pivoting housing that fits both square and rectangular footprints and mounts to round or rectangular duct work. This unit senses smoke in the most challenging conditions operating in airflow speeds of 100 to 4000 feet per minute temperatures of -4F to 158F and a humidity range of 0 to 95 percent non-condensing. A plug-in sensor head offers improved false alarm immunity and simple installation testing and maintenance. An improved cover design isolates the sensor head from the low-flow feature for simple maintenance.