The Tri-Delta PPS10055-2412 80K1101 Furnace Air Pressure Switch monitors furnace vent pressure and inducer airflow to verify proper draft before allowing burner ignition. It has a silver housing and is designed for installation inside the furnace control assembly, with a pressure hose port and electrical terminals for connection. This HVAC pressure safety switch acts as an interlock to confirm draft conditions in gas furnaces, protecting ignition in residential and commercial heating systems. It is used in Lennox and related furnace applications, with OEM reference 80K1101.
