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  1. #1
    Join Date
    Nov 2007
    Posts
    5

    Confused Outside or inside combustion air?

    I am having a new gas furnace (95 percent efficient) installed on Friday and am undecided on whether to have combustion air piped from outside or drawn from basement.

    The contractor is willing to do both and it is my preference. Intake pipe will be neatly run next to the exhaust pipe. I will have to put some vents in the door to the mechanical room in order to meet the volume/BTU requirement if I go with inside air. Not a big deal, have already purchased the vents.

    Anyone have quick thoughts on this matter?

    Thanks,
    John
    Last edited by Johndel; 12-05-2007 at 11:36 PM.

  2. #2
    Join Date
    May 2004
    Location
    Rapid City, SD
    Posts
    7,414
    Always pipe in your combustion air... that's an easy one.

    If you are drawing from inside your house, then you're blowing that air outside. That air has to be made up (which is why you have to vent that room with the loovered door). Usually the air is made up by leaks around windows, cracks, etc. Now you're bringing in unconditioned air that's not filtered into your house to make up for the air you've heated and conditioned you're blowing out the exhaust of the furnace.

    I betcha you'll get a 100% vote here to pull in the combustion air from outside
    "If you call that hard work, a koala’s life would look heroic."

  3. #3
    Join Date
    Jan 2006
    Location
    Powell River, BC, Canada
    Posts
    763
    Quote Originally Posted by amickracing View Post
    Always pipe in your combustion air... that's an easy one.

    I betcha you'll get a 100% vote here to pull in the combustion air from outside


    Ayuh.
    Where are you? Are you done yet? I got ONE more call for you.....

  4. #4
    Join Date
    Dec 2004
    Location
    Derby City
    Posts
    3,958
    Definitely pipe in your combustion air.

    I am only surprised at the fact the contractor is making this an "option."

    all the best, Irish
    Everyone has a purpose in life..........even if it's to be a bad example.

    Seek first to understand, before seeking to be understood.

  5. #5
    Join Date
    Mar 2005
    Location
    burlington county n.j.
    Posts
    9,701
    100% outdoor air for combustion, we will not do it any other way.

  6. #6
    Join Date
    Dec 2002
    Location
    Rochester, MN
    Posts
    5,304
    100% outside here in my book!

    If you don't want the ugly goose neck look, request the BAYVENT.

  7. #7
    Join Date
    Nov 2007
    Location
    Chicago
    Posts
    76
    Quote Originally Posted by Irishmist View Post
    Definitely pipe in your combustion air.

    I am only surprised at the fact the contractor is making this an "option."

    all the best, Irish
    I'm more surprised that the contractor even gave the customer the option to have it piped from outdoors.

  8. #8
    Join Date
    Aug 2004
    Location
    North Richland Hills, Texas
    Posts
    14,914
    Ditto to the "pull it from outdoors" crowd.
    If more government is the answer, then it's a really stupid question.

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