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  1. #1
    Join Date
    Dec 2010
    Location
    Illinois
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    64

    Default Maximum elbows allowed

    I just had a Amana high efficiency gas furnace put in. When they got done I noticed that there are 7 elbows in the exhust and 5 in the combustion draw pipe.Wondering what the max is. Also is it okay to leave the combustion air pipe off and pull straight from basement? My parents is like that. Is plenty big of a basement but not sure on the rule there. Thanks!

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  2. #2
    Join Date
    Mar 2007
    Location
    Philadelphia PA
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    3,177

    Default Re: Maximum elbows allowed

    The first thing I would do is look at the installation manual, which you should have, or if you don't, it's no doubt available online.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
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  3. #3
    Join Date
    Mar 2007
    Location
    Chicago, IL
    Posts
    2,797

    Default Re: Maximum elbows allowed

    Quote Originally Posted by Eric Smith View Post
    Also is it okay to leave the combustion air pipe off and pull straight from basement?
    Allowed by some manufacturers, not allowed or not recommended by others. Also, some manufacturers require an elbow or other protection at the intake at the furnace to prevent blockage.

    Bottom line: check the manufacturer's installation instructions for the specific model of furnace or boiler.

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  4. #4
    Kevin Yandel's Avatar
    Kevin Yandel Guest

    Default Re: Maximum elbows allowed

    Refer to g2427.4 for venting, cat 4 appliances as specified or furnished by the manufacturer.


  5. #5
    Join Date
    Feb 2008
    Location
    Chicago IL
    Posts
    1,984

    Default Re: Maximum elbows allowed

    The install manual lists how many 90's allowed based on pipe size and pipe run length. You have to look at the manual for that unit. 7 seems a bit much.

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