Trane CNT4320 SPST Differential Pressure Control Open 3" Close15"

The Trane CNT4320 is a differential pressure control switch for Trane HVAC systems. This is a spst switch crucial to prevent unsafe and inefficient operation by monitoring air pressure differentials in ductwork or other air handling components. A little switch with a built-in pressure gauge. The switch opens when the air pressure goes below a predetermined low threshold of approximately 0.00021 PSI. The switch closes when pressure exceeds a higher setpoint of about 0.0042 PSI. The CNT4320 can stop or allow current flow based on the pressure differential to control exhaust fans and dampers.