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  1. #1
    Norm Peery's Avatar
    Norm Peery Guest

    Default Rust on furnace vent

    I saw this today on 2 split HVAC units.The air handlers etc., were horizontal, hung in the attic. Rust was noted on both vent pipes and rust in the condensate pan directly under the pipe. Never seen this before, no indication anywhere of moisture intrusion.
    Does anyone have an idea?

    Norm

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  2. #2
    Join Date
    Aug 2007
    Location
    Memphis TN.
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    4,311

    Default Re: Rust on furnace vent

    Quote Originally Posted by Norm Peery View Post
    .
    Does anyone have an idea?

    Norm
    .
    Heat Exchanger has a hole in it .
    .

    It Might have Choked Artie But it ain't gone'a choke Stymie! Our Gang " The Pooch " (1932)
    Billy J. Stephens HI Service Memphis TN.

  3. #3
    Ted Menelly's Avatar
    Ted Menelly Guest

    Default Re: Rust on furnace vent

    Quote Originally Posted by Norm Peery View Post
    I saw this today on 2 split HVAC units.The air handlers etc., were horizontal, hung in the attic. Rust was noted on both vent pipes and rust in the condensate pan directly under the pipe. Never seen this before, no indication anywhere of moisture intrusion.
    Does anyone have an idea?

    Norm
    Yep. An HVAC contractor has to come for further evaluation for repairs/replacement.

    Anyway. That is not just a little rust from the flue. That is a serious fault such as in what Bill might be thinking. I have not seen that kind of rust from a flue pipe in years.


  4. #4
    Join Date
    Mar 2007
    Location
    Chicago, IL
    Posts
    2,797

    Default Re: Rust on furnace vent

    HE problems seems unlikely in two units, unless a know problem for that model.

    Here in Chicago that could be the result of condensation within single wall vent pipe passing through an unconditioned space (the attic) - don't know about your AZ climate, though.

    Last edited by Michael Thomas; 12-08-2009 at 05:09 PM.
    Michael Thomas
    Paragon Property Services Inc., Chicago IL
    http://paragoninspects.com

  5. #5
    Norm Peery's Avatar
    Norm Peery Guest

    Default Re: Rust on furnace vent

    Michael,
    The climate is very mild, and very dry. 1st time I have seen this. The weird thing is, it's on the vent pipes for both units. One is rusted worse than the other, but...........
    Still wondering.
    Thanks,
    Norm


  6. #6
    Join Date
    Mar 2008
    Location
    Charlotte NC
    Posts
    2,303

    Default Re: Rust on furnace vent

    Is there a chance these are Hi-efficiency condensing furnaces that should have been vented with PVC?


  7. #7
    Join Date
    Mar 2007
    Location
    Near Philly, Pa.
    Posts
    1,643

    Cool Re: Rust on furnace vent

    The male end of the vent connector is pointing down, which means ALL the condensate remains in the vent and puddles at the base of that ell.

    You need a qualified tech to perform a comprehensive inspection and service including combustion analysis to see why this unit is condensing and if there are other problems such as with the HX.

    What does the rest of the chimney/ vent look like?

    Is that secondary drain on the A coil unplugged?

    Bob

    Keep the fire in the fireplace.

  8. #8
    David Bell's Avatar
    David Bell Guest

    Default Re: Rust on furnace vent

    Being that both units are doing the same thing I would Guess that the attic space is too tight and does not provide enough combustion air for the units


  9. #9
    David Bell's Avatar
    David Bell Guest

    Default Re: Rust on furnace vent

    Is that secondary drain on the A coil unplugged?



    the secondary should be capped, and a pan switch installed


  10. #10
    john_opwin's Avatar
    john_opwin Guest

    Default Re: Rust on furnace vent

    To prevent Furnace filter from rust it should be replaced or cleaned in three or four times in a year.


  11. #11
    Join Date
    Mar 2007
    Location
    Philadelphia PA
    Posts
    3,177

    Default Re: Rust on furnace vent

    Quote Originally Posted by john_opwin View Post
    To prevent Furnace filter from rust it should be replaced or cleaned in three or four times in a year.
    ?? How does the filter get rusty??

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

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