The fogged mirror shows presence of leaking flue gases at the connection between the furnace inducer and the vent pipe above. This connection should be carefully sealed by a qualified heating contractor. Leaks at the inducer connection is not unusual, even in new furnaces.

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Flue Gas Spillage at Furnace Rust is a good indicator Foggy mirror shows spillage Flue gas leakage at new furnace Flue gas spillage at water heater fire box door

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