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Thread: Furnace venting

  1. #1
    Join Date
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    Default Furnace venting

    Came across a high efficiency gas furnace venting through the side of a wood boxed framing that houses the metal flue for a wood burning fireplace. Sorry the picture is not that good, but I circled the pvc pipe where it exits the wood boxing. The supply air is taken from the crawlspace.
    Have any of you ever seen this before?...I will be returning tomorrow to pick up the radon test and will get a better picture. I had a good one and it was deleted.

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  2. #2
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    Default Re: Furnace venting

    Very unusual. Any chance you were able to get a view of the chase interior from inside the attic? I wonder if the PVC pipe has the proper clearances around the fireplace flue pipe.

    "It takes a big man to cry. It takes an even bigger man to laugh at that man". - Jack Handey

  3. #3
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    Default Re: Furnace venting

    sidney

    when did you do the inspection ??==could not open picture

    cvf


  4. #4
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    Default Re: Furnace venting

    Quote Originally Posted by Nick Ostrowski View Post
    Very unusual. Any chance you were able to get a view of the chase interior from inside the attic? I wonder if the PVC pipe has the proper clearances around the fireplace flue pipe.
    Will look tomorrow as the ladder I had with me would not fit in the closet. What is the proper clearance for PVC and a metal flue pipe?


  5. #5
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    Default Re: Furnace venting

    Quote Originally Posted by CHARLIE VAN FLEET View Post
    sidney

    when did you do the inspection ??==could not open picture

    cvf
    did the inspection yesterday (monday)


  6. #6
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    Default Re: Furnace venting

    Quote Originally Posted by sidney alstad View Post
    Will look tomorrow as the ladder I had with me would not fit in the closet. What is the proper clearance for PVC and a metal flue pipe?
    Clearance will depend on the flue pipe. I believe for wood burning fireplace flues it should be at least 2" but look for a stamp or sticker on the flue pipe itself. Bob Harper may chime in and give more detailed info.

    "It takes a big man to cry. It takes an even bigger man to laugh at that man". - Jack Handey

  7. #7
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    Cool Re: Furnace venting

    Each factory built chimney or vent will have its stated clearance to combustibles lableled on it and in the manual. Most, but not all, woodburners require 2" clearance. Most but not all gas direct vents and B-vent require 1" off the vertical run.

    The mfr. will state the requirements for vertical venting of the furnace. The intake should pull directly from outdoors but probably is not required by the mfr.

    When you penetrate the fireblocking, the AHJ will dictate what he wants to see there. I would expect he would want to see some sort of high temperature caulking or chinking. The pvc should be smaller than the hole to allow for thermal expansion. Also look for room where it penetrates the chase wall and how it is caulked against water. The pvc should have proper support and stability so it doesn't flop around.

    If the termination meets all the requirements in the code and listed instructions then it may be acceptable.

    Keep the fire in the fireplace.

  8. #8
    Tom Kio's Avatar
    Tom Kio Guest

    Default Re: Furnace venting

    Oh, the picture is to small, you can add a more bigger picture.


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