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Thread: Combining Vent Pipes

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  1. #1

    Default Combining Vent Pipes

    I have four 1-1/2" vent pipes in my attic that I would like to combine into a single exit through the roof. What size should that pipe be, or how should I do it?

    Do the pipe sizes need to increase as they are combined (as with drain pipes)?

    Thanks

  2. #2
    Master Plumber-Gas Fitter shacko's Avatar
    Join Date
    Jan 2006
    Location
    Rosedale, Md
    Posts
    561

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    You can combine them into one 2in. vent. Do you have a larger vent in that area? if so you can run them into that if it's 3in. or larger.

  3. #3
    Plumber Winslow's Avatar
    Join Date
    Dec 2005
    Location
    Hawaii
    Posts
    450

    Default

    you can join them all together but the size after joining depends on what is attached to the individual vents, depending on which code you are under. According to the UPC you can join them all together under a 2" vent as long as the overall fixture units do not exceed 24.

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