Pay in 4 interest-free payments of $19.40 Learn more
Ships within 48 hours · Estimated delivery Sep 24 - Sep 29
Whether you are performing a condenser coil repair or a full HVAC system maintenance
this cartridge-style unit provides the reliability required to prevent unexpected mechanical failure and costly service callbacks
This model features a standard 7-1/2 inch x 7-1/2 inch mounting pattern
it manages thermal expansion and pressure spikes in high-output hydronic setups
Lennox 57M66 Pressure Switch 30067439-890 Whether you are performing aThe Lennox 57M66 Pressure Switch is a critical safety component designed for precise combustion air proving in high efficiency gas furnaces. Factory calibrated to actuate at 1. 41" WC, this Single Pole Single Throw (SPST) switch ensures the inducer motor is generating sufficient static pressure to vent flue gases safely before allowing the ignition sequence to proceed. As a genuine OEM replacement part, it maintains the exact specifications required
US$ 175.50
US$ 35.00
US$ 1026.00
US$ 106.50