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Lennox 63W40 Pressure Switch 30067439-890 Will this work with propaneThe Lennox 63W40 Pressure Switch is a critical OEM replacement component for two stage furnaces and heat pumps, including the G60DF and G60UH series. Designed to ensure safe combustion cycles, this dual pressure switch features factory calibrated set points of 0. 20" WC for low stage operation and 0. 40" WC for high stage performance. As a veteran grade HVAC pressure switch, it monitors the negative pressure generated by the inducer motor, providing