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8" WC threshold from being met
the P200200 Williams Fan Switch is compatible with Counterflow Top Vent (3508
but it should be protected from direct weather exposure within a suitable enclosure
which is essential for maintaining a consistent flame pattern and optimizing fuel combustion efficiency
reducing motor stress and extending HVAC compressor lifecycle in industrial settings
Lennox 34M73 Pressure Switch 319825-402 8" WC threshold from beingThe 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,