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Thread: Combustion Air?

  1. #1
    Join Date
    Mar 2007
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    Default Combustion Air?

    Chapter 17 IRC requires an inlet and an outlet duct (one near ceiling/one near floor) for purpose of providing combustion air. Yet, I continually see one duct only in in ceilings of garages and laundry rooms. Could all of these be incorrect? Any info will be appreciated.

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  2. #2
    Join Date
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    Default Re: Combustion Air?

    Tom,

    Do they meet this?

    From the IRC.
    G2407.6.2 (304.6.2) One-permanent-opening method.
    One permanent opening, commencing within 12 inches (305 mm) of the top of the enclosure, shall be provided. The appliance shall have clearances of at least 1 inch (25 mm) from the sides and back and 6 inches (152 mm) from the front of the appliance. The opening shall directly communicate with the outdoors or through a vertical or horizontal duct to the outdoors, or spaces that freely communicate with the outdoors (see Figure G2407.6.2) and shall have a minimum free area of 1 square inch per 3,000 Btu/h (734
    mm
    2/kW) of the total input rating of all appliances located in the enclosure and not less than the sum of the areas of all vent connectors in the space.




    Jerry Peck, Construction / Litigation Consultant
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  3. #3
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    Default Re: Combustion Air?

    Combustion Air Sources

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  4. #4
    Join Date
    May 2007
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    Default Re: Combustion Air?

    Now for the next question; do they really work?

    Measured Performance more than just a buzzword

  5. #5
    Bob Mayer's Avatar
    Bob Mayer Guest

    Default Re: Combustion Air?

    Quote Originally Posted by Michael Thomas View Post
    Combustion Air Sources
    Note that this table Michael cites uses the incorrect units of BTU instead of BTU/h. Using BTU instead of BTU/h seems to be getting more common.

    - BOB


  6. #6
    Join Date
    Mar 2007
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    Smile Re: Combustion Air?

    Thanks Guys for the info. Don't know how I ever got along without you.


  7. #7
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    Default Re: Combustion Air?

    "Note that this table Michael cites uses the incorrect units of BTU instead of BTU/h. Using BTU instead of BTU/h seems to be getting more common."

    Bob,

    Head right on over to Ft. Collins, and bust their chops:

    http://fcgov.com/nbs/pdf/basement.pdf


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