Is 28M97 compatible with all Lennox furnaces

Disconnect power and use a multimeter to check the resistance across the leads

Is this compatible with LP or Natural Gas systems

Key Benefits Direct Replacement: Seamlessly replaces the older 40-4A3-3AM model without piping modifications

designed to meet the same technical specifications

Reznor 177633 Pressure Switch Els PW 17895 Is 28M97 compatible with allThe Reznor 177633 Pressure Switch is a critical OEM replacement part designed for precision monitoring within commercial gas heating systems. Engineered for unit heaters and duct furnaces, this combustion air pressure switch kit is factory calibrated to a 0. 50" W. C. setpoint (water column). The Reznor 177633 ensures safe ignition sequences and reliable venting verification by detecting proper differential pressure before allowing the gas valve to