42" air pressure switch (1

Installing a blade with a different pitch than the specified 38 degrees can lead to motor overloading or insufficient airflow

Smith and Lochinvar technical assemblies

This sensor is a genuine Lennox HVAC part but is also used in equipment from Allied

Lennox 97J69 Pressure Switch 328140-751 42" air pressure switch (1The Lennox 97J69 Pressure Switch is a critical safety component designed for specific Lennox furnace models to monitor induction blower performance and flue venting integrated within the combustion circuit. This SPST (Single Pole Single Throw) vacuum switch is factory calibrated to a . 85" WC (Water Column) set point, ensuring the system only initiates the ignition sequence when proper static pressure is established. Featuring a standard 1 4" barb