Lochinvar & A.O. Smith 100145007 Fan Kit 320788-704 Balanced Port Technology: Mitigates the
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Lochinvar & A.O. Smith 100145007 Fan Kit 320788 704 Balanced Port Technology: Mitigates the Balanced Port Technology: Mitigates the impact of changing pressure drops across the valve ensure the flame sensor is clean and the furnace control board ground is secure