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    AskDrKari's Avatar
    AskDrKari Posts: 2, Reputation: 1
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    #1

    Mar 11, 2007, 11:34 AM
    Furnace exhaust pipe with white material
    We have a 4 year old Ruud gas furnace and I noticed today that there is white, flakey material coming from the joints on the exhaust pipe.
    What is this?
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    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #2

    Mar 11, 2007, 12:43 PM
    I think it is zinc oxide carried out by condensation. I am asking to have you question moved to Heating and Air Conditioning. Trust an answer from Northern Heat or Ttop.
    NorthernHeat's Avatar
    NorthernHeat Posts: 1,455, Reputation: 132
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    #3

    Mar 11, 2007, 07:36 PM
    It is normal, just impurities in the gas that condense with the flue gas.
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