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Thread: Combustion Air

  1. #1
    Join Date
    Apr 2004
    Location
    Midwest
    Posts
    2,683

    Combustion Air

    Can anybody give me any information on calculating or requirements of combustion air on a wood burning firplace?


    Thanks!
    Live each day like it is your last, for one day you will be right!

  2. #2
    Join Date
    Apr 2004
    Location
    Midwest
    Posts
    2,683
    Nothing? LOL
    Live each day like it is your last, for one day you will be right!

  3. #3
    Join Date
    Jan 2011
    Location
    Huntley, IL
    Posts
    25

    You will have to back into it...

    First, check with the stove/fireplace manufacturer.... if that doesn't work, try below.

    It depends on the size of your stove/fireplace and how much wood you burn.

    I found this website (two links) to be very useful:
    http://www.chimneysweeponline.com/howood.htm

    at the bottom of that page it shows how he derived these numbers:http://www.chimneysweeponline.com/howoodbtu.htm

    From the example given on the second link, a 1 lb. of Osage Orange would be equal to 8660 btu which if used to develop combustion air calculation, would be conservative/safe. The other two numbers given with moisture content would be more realistic, but less safe.

    Once you know how many BTU's your stove/fireplace would burn you can calulate the indoor combustion air at 50 cubic feet/1000 btu of wood being burned or vent openings of 2 square inches/1000 btu with a minimum of 100 square inches for each of the two required openings (IFCG 304.5).

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