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Thread: Furnace venting inside a wall

  1. #1
    DIY Member sctclimbs's Avatar
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    Apr 2006
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    Default Furnace venting inside a wall

    I am remodeling a bathroom. When I ripped out the shower stall I found behind the wall is my furnace vent pipe which is 7 in. diamter Type B gas vent pipe.. So rather having just a stud wall, the wall behind the shower was framed seperately 5 inches out from the framing of the other interior wall to allow enough space for the pipe plus the 1 inch gap on each side that is required clearance from combustable materials. I would really love to regain that 5 inches of space to allow for a larger shower. Can I just replace that section of vent pipe with an oval pipe that is designed to go inside stud walls?

  2. #2
    Plumber jimbo's Avatar
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    I have not seen 8" oval. Amerivent seems to have only 4,5,6

  3. #3
    DIY Member sctclimbs's Avatar
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    I screwed up, it is a 6 inch pipe. So can I just change it to a 6 inch oval?

    Actually, the vent connector coming out of the furnace is 4 inch type B pipe. For some reason it then changes to 6 inch. The pipe serves only the furnace, no other appliances connect into it. I'm guessing when the old furnace was replaced they just kept the original 6 in. pipe in place. Am I wrong to think that I could change the entire vent system to 4 inch pipe with 4inch oval going thru that section of wall?

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    Maybe....see if you can find the manual for the furnace and see what they require.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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