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

cutting or kinking the tube will destroy the sensing bulb functionality and render the part useless

42" air pressure switch (1

Penguin II

and Marley Engineered Products electric heating installations

Lennox 97J69 Pressure Switch 328140-751 Installing a blade with aThe 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