including the FX

DSI (Direct Spark Ignition)

ensuring optimized centrifugal force to maintain consistent static pressure and airflow across your indoor coils

What are the symptoms of a failed York pressure switch

ensuring efficient field installations without the need for extensive modification or lead rerouting

Lennox 34M73 Pressure Switch 321702-401 including the FXThe Lennox 34M73 Pressure Switch is a critical safety component designed for precise furnace draft inducer monitoring in residential and commercial heating systems. This OEM Lennox replacement part is factory calibrated to a . 22"wc set point, ensuring the exhaust vent maintains adequate negative pressure before allowing the ignition sequence to proceed. Featuring a Single Pole Single Throw (SPST) configuration and a standard 1 4" barb connection,