Using this inducer motor pressure switch ensures the system remains within peak performance specs while preventing lockout codes related to venting issues

safety limits should never be downgraded

concentrated blue flame for maximum combustion efficiency

This is a normally closed model

Common indicators include the furnace failing to ignite after the inducer motor starts

System Sensor D4120 Detector 30067439-890 Using this inducer motor pressureThe System Sensor D4120 is an industrial grade 4 wire photoelectric duct smoke detector designed for high performance smoke detection in HVAC air handling systems. This InnovairFlex duct smoke detector operates across a wide air velocity range of 100 to 4,000 feet per minute, making it suitable for both low flow and high volume applications. It features a versatile pivoting housing that accommodates square or rectangular footprints and mounts easily