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  1. #1
    Join Date
    Apr 2008
    Location
    McKinney Texas
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    475

    Default UNPROTECTED GAS FLUE VENTS ON ROOF, SEE PHOTOS

    From today’s inspection. One builder was building every home in the neighborhood. In all homes except the one I happened to be inspecting had conventional metal furnace flue vents. The house I inspected had schedule 40 PVC flue vents however on the roof, the PVC flues had no way to prevent rain water from entering the top of the flues. From the roof, the furnace flues appeared to be plumbing wet vent stacks. This local area had approximately ½ inch of rain in the past 24 hours. Both HVAC condensate pans contained about one inch of water and water inside the cabinet. The outside temperate was around 40 degrees so the units were in heat mode, not cooling mode so there was no condensate from AC operation.
    FLUE VENTS.jpg.IMG_8344.JPGIMG_8550.JPGIMG_8342.JPG

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  2. #2
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    26,246

    Default Re: UNPROTECTED GAS FLUE VENTS ON ROOF, SEE PHOTOS

    Quote Originally Posted by Gene South View Post
    In all homes except the one I happened to be inspecting had conventional metal furnace flue vents. The house I inspected had schedule 40 PVC flue vents ...
    Possible that your house had higher efficiency heater and the vent was condensing the water to the PVC vent, which then (naturally) ran back down (due to gravity) and out the bottom of the vent?

    If so, there should be a method to collect that condensate and drain it off to a place of disposal.

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  3. #3
    Join Date
    Mar 2008
    Location
    Charlotte NC
    Posts
    2,303

    Default Re: UNPROTECTED GAS FLUE VENTS ON ROOF, SEE PHOTOS

    Quote Originally Posted by Gene South View Post
    From today’s inspection. One builder was building every home in the neighborhood. In all homes except the one I happened to be inspecting had conventional metal furnace flue vents. The house I inspected had schedule 40 PVC flue vents however on the roof, the PVC flues had no way to prevent rain water from entering the top of the flues. From the roof, the furnace flues appeared to be plumbing wet vent stacks. This local area had approximately ½ inch of rain in the past 24 hours. Both HVAC condensate pans contained about one inch of water and water inside the cabinet. The outside temperate was around 40 degrees so the units were in heat mode, not cooling mode so there was no condensate from AC operation.
    FLUE VENTS.jpg.IMG_8344.JPGIMG_8550.JPGIMG_8342.JPG
    1/2 inch of rain is only about 1/2 cup of water into the vent. While a scupper would have prevented that 1/2 cup from entering the furnace, I don't think the rain water is the real problem. The furnace condensate drain should be able to handle much more water than that. I think the traps built into the furnace or drain lines from the fan housing are clogged.

    One other possibility is that the condensate drains are connected in the furnace vertical configuration rather than horizontal.

    Last edited by Vern Heiler; 03-10-2015 at 07:34 PM.
    The beatings will continue until morale has improved. mgt.

  4. #4
    Join Date
    Mar 2007
    Location
    Plano, Texas
    Posts
    145

    Default Re: UNPROTECTED GAS FLUE VENTS ON ROOF, SEE PHOTOS

    Billy Stephens posted this back in 2007.
    Might be of help. It shows that the vent stacks are proper at the roof.

    - - - Updated - - -

    Billy Stephens posted this back in 2007.
    Might be of help. It shows that the vent stacks are proper at the roof.

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  5. #5
    Join Date
    Mar 2008
    Location
    Charlotte NC
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    2,303

    Default Re: UNPROTECTED GAS FLUE VENTS ON ROOF, SEE PHOTOS

    Quote Originally Posted by Gary Burnett View Post
    Billy Stephens posted this back in 2007.
    Might be of help. It shows that the vent stacks are proper at the roof.

    - - - Updated - - -

    Billy Stephens posted this back in 2007.
    Might be of help. It shows that the vent stacks are proper at the roof.
    Installation instructions are for a up-flow furnace which is not designed for horizontal installation. You must use the installation instructions for the furnace in the O.P. It should show two different condensate drain ports, one for vertical and one for horizontal.

    The beatings will continue until morale has improved. mgt.

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