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    Joywash01's Avatar
    Joywash01 Posts: 3, Reputation: 1
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    #1

    Sep 12, 2009, 07:31 AM
    The net free area
    The net free area of an opening combustion air from an directly from outdoors she be 1 square inch per 4000 btuh of the fuel burning appliances input ratings, therefore, a 160,000 appliance obtaining combustion air directly from outdoors would require a minimum opening of -------?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Sep 12, 2009, 07:37 AM
    Is this a test? Are you testing us or are you taking a test

    Get out the books and re-read, is all I know, since I don`t understand the question
    Joywash01's Avatar
    Joywash01 Posts: 3, Reputation: 1
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    #3

    Sep 12, 2009, 08:15 AM
    This is homework, and that is how the question was written.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #4

    Sep 12, 2009, 10:05 AM
    I would guess you would divide the total BTU`s (160,000) by the 1 sq inch per 4,000,, which would be 160,000 divided by 4,000,, total of 40 sq. inches

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