PRESSURE SWITCH , 42-102069-02

Pressure Switch Assembly, For Use With: Gas Furnaces. This safety device, also known as a furnace air switch, monitors the vacuum pressure created by the inducer motor. The switch is a safety device that monitors the vacuum created by the furnace's inducer motor. If the motor is not running at the correct speed to vent exhaust gases, the pressure switch will detect the change and shut down the furnace to prevent it from operating unsafely.