Lennox 75M20 Pressure Switch Refrigerant How do I confirm if

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Lennox 75M20 Pressure Switch Refrigerant How do I confirm ifThe Lennox 75M20 Pressure Switch is a critical safety component engineered for high altitude gas furnace applications, specifically calibrated for elevations between 4501 and 7500 feet. This OEM Lennox replacement part, also identified as 75M2001, monitors the inducer motor's static pressure to ensure the combustion air system is clear and operational before allowing the ignition sequence to initiate. With a precise fixed set point of 0. 75" WC (water