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heat exchangers
Key Benefits Engineered for 5
Rugged Build Quality: Built for industrial use and high-cycle applications in demanding HVACR environments
preventing premature HVAC rollout switch failures and nuisance trips
Lennox 12W49 Pressure Switch 321702-401 heat exchangersThe Lennox 12W49 Pressure Switch (Model R20558702) is a critical OEM safety component engineered for precise combustion air monitoring in Lennox gas furnaces. This SPST pressure switch is factory calibrated to actuate at 1. 35" W. C., ensuring the inducer motor generates sufficient draft for safe venting before the ignition sequence begins. Designed for professional grade reliability, it features a standardized 1 4" barb connection for secure