040-440

This high-quality Flow Switch, also classified as an Air Pressure or Air Proving Switch, is a critical safety component designed to monitor and verify proper airflow within high-performance appliances. Functioning as a safety interlock, the switch detects the differential pressure generated by a blower motor or exhaust fan to ensure that the system is venting correctly before allowing the heating element or burner to ignite. If airflow is interrupted or restricted, the switch breaks the electrical circuit to prevent overheating and hazardous conditions. This replacement part is essential for restoring the safe operation of forced-air systems, ensuring that your equipment runs efficiently and meets standard safety protocols.
Type: Air Pressure Switch / Air Proving Switch
Size: Standard
Application: Commonly used in HVAC systems, furnaces, power-vented water heaters, and commercial exhaust ventilation systems to ensure proper blower operation and venting safety.
Specifications: Pressure-actuated electrical contact; acts as a safety proving mechanism for forced-draft and induced-draft appliance configurations.