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  1. #1
    Join Date
    Jul 2019
    Location
    VA
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    5

    Default Gas furnace intake and exhaust pipes

    When inspecting a Ducane gas furnace I saw that the fresh air intake and the exhaust pipes came together in one pipe just before exiting the basement wall. Is this acceptable?

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  2. #2
    Join Date
    Mar 2007
    Location
    Santa Rosa, CA
    Posts
    2,868

    Default Re: Gas furnace intake and exhaust pipes

    Quote Originally Posted by Robert Huffman View Post
    When inspecting a Ducane gas furnace I saw that the fresh air intake and the exhaust pipes came together in one pipe just before exiting the basement wall. Is this acceptable?
    Sounds like your question refers to a category 1 furnace. If that is true, then there are concentric intake/exhaust vent pipes that are specifically designed and approved for that. I guess the primary advantage is that you only have to poke one hole in the roof. Search category 1 concentric vent and you will see examples.

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