773-406

This high-quality air pressure switch is a critical safety component designed for modern gas furnaces and HVAC systems. Also known as an air proving switch, it ensures your heating system operates safely by monitoring the negative pressure created by the draft inducer motor. This switch verifies that the exhaust flue is clear and that there is sufficient airflow for combustion before allowing the furnace to ignite. Rated for a 0.90" WC (Water Column) trip point, it is a reliable solution for troubleshooting furnace ignition failures, short-cycling, or pressure-related error codes. Built for durability and precise sensing, it is an essential replacement part for maintaining optimal heating performance and home safety.
Type: Air Pressure Switch
Size: Standard HVAC Component
Application: Used in residential and commercial gas-fired furnaces and heating units to prove inducer motor draft and ensure proper venting.
Specifications: Pressure Rating: 0.90" WC, Function: Air Proving / Safety Interlock, Sensing Type: Negative Pressure