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Thread: size vent

  1. #1
    DIY Junior Member el pacha's Avatar
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    Nov 2011
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    New York
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    Default size vent

    i got 2 problems,
    1. how much should be the minimum diameter of a circuit vent totaling 55 feet developed length and serving a horizontal drain branch, handling 120 dfu's?

    2.a vent stack handling 25 dfu's with a developed lenght of 35 feet, how much should be the minimum of diameter?

  2. #2
    Moderator & Master Plumber hj's Avatar
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    Aug 2004
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    Cave Creek, Arizona
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    Default

    1. If you do not already know the answers to these two questions, you may be doing a job you are not qualified for.
    2. Your blueprint, which you used to get your permit, should have these sizes specified on its plumbing diagram.
    Licensed residential and commercial plumber

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