638-066

This SPDT Vent Damper Door Switch is an essential safety and operational component for residential and commercial gas heating systems. Functioning as a Single Pole Double Throw (SPDT) mechanism, this switch ensures that the appliance's vent damper is correctly positioned before allowing the heating cycle to proceed. It plays a critical role in preventing the ignition of the furnace or boiler if exhaust gases cannot be safely vented, protecting your home or building from carbon monoxide backup. Designed to handle 125/250VAC electrical loads, this durable metal venting switch is a common replacement part for gas furnaces and HVAC units experiencing ignition failure or intermittent operation. Its reliable contact action provides accurate signaling to the control board, ensuring efficient and safe appliance performance.
Type: HVAC Electrical Switch / Venting Component
Size: Small
Application: Used in gas furnaces, boilers, and heating appliances equipped with automatic vent damper assemblies to monitor door position and ensure proper exhaust flow.
Specifications: Single Pole Double Throw (SPDT) configuration, rated for 125/250VAC, compatible with metal venting systems.