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Thread: Vent size

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  1. #1

    Default Vent size

    I am installing a new 3" pvc line for a toilet, the vent will be 3' downstream. My ? is will 1.5" pvc be ok for vent size?
    Last edited by damorej; 02-10-2005 at 12:32 PM.

  2. #2
    Plumber RioHyde's Avatar
    Join Date
    Sep 2004
    Cincinnati, Ohio


    That really depends on the code requirements for your part of the country. Here, the vent must be a minimum of half the size of the drain it serves so 1-1/2" vent would be the minimum size for a 3" drain. However, in reading through the posts since I've joined, I've seen that some municipalities require a 2" vent for a toilet. Call your local building dept. and ask what the requirements for your area are. I'm sure they'll be happy to help you out.

    On a side note, I'm installing a bathroom in my basement at the present time. My vent for my toilet will be "oversized" to 2". I just like to "overdo" now and then especially on my own plumbing.


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