773-394

This high-quality 0.40" WC Air Pressure Switch is an essential safety component designed for residential gas furnaces and HVAC heating systems. Functioning as an air-proving switch, it monitors the static pressure generated by the draft inducer motor to ensure that combustion gases are being properly exhausted before the ignition sequence begins. If the switch detects a venting obstruction or insufficient airflow, it prevents the unit from firing, protecting your home from potential flue gas backup. This reliable replacement pressure sensor is ideal for restoring the safe and efficient operation of your heating system during the winter months.
Type: Air Pressure Switch / Air Proving Switch
Size: Compact
Application: Commonly used in high-efficiency gas furnaces and HVAC air handling units to verify proper venting and inducer motor performance.
Specifications: Pressure Trip Point: 0.40" WC (Water Column); Function: Air Proving/Safety Interlock; Application: Negative pressure sensing for combustion air systems.