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Thread: Combustion Air?

  1. #1
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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 ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  3. #3
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    Default Re: Combustion Air?

    Combustion Air Sources

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  4. #4
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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
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    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
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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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