Lennox 78W57 Pressure Switch 322838-753 While surface debris can sometimes

While surface debris can sometimes be cleared with a soft brush

this 5-blade

suitable for managing various damper sizes in commercial units

while the manual trip lever provides a mechanical method to assure shutdown during maintenance

Lennox 78W57 Pressure Switch 322838-753 While surface debris can sometimesThe Lennox 78W57 Pressure Switch is a high precision, factory authorized OEM replacement engineered for draft proving and airflow safety monitoring in Lennox heating and cooling systems. Specifically calibrated to actuate at 0. 27" WC (Water Column), this SPST pressure switch features a 1 4" barb connection for secure integration into existing 24V control circuits. Designed as a direct replacement for Lennox part number 101572 04, it is a critical