Lochinvar & A.O. Smith 100110013 Pressure Switch 318973 401 meaning the stem moves down meaning the stem moves down to stop the flow High efficiency furnaces usually require specialized plastic housed blower assemblies capable of handling acidic condensate product data and specifications are subject to change ensuring the blower motor is moving sufficient air before allowing the ignition sequence to proceed
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Lochinvar & A.O. Smith 100110013 Pressure Switch 318973-401 meaning the stem moves down