The Lennox 14T65 Combustion Air Pressure Switch Kit is a genuine replacement component designed to monitor and verify proper airflow within compatible Lennox gas furnaces. It works by sensing the correct air pressure created by the draft inducer before allowing the ignition sequence to continue, helping ensure safe and efficient furnace operation. This pressure switch is used in resid... https://www.partshnc.com/high-altswtchkit-7501-10000ft