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Thread: to vent or not to vent kitchen sink?

  1. #1
    DIY Member remodelbob's Avatar
    Join Date
    Jun 2005

    Default to vent or not to vent kitchen sink?

    I had a plumber buddy by my project (complete remodel of house, relocating all plumbing in kitchen and master bath) the other day and he said if I run 2" that I don't need to vent my kitchen sinks (one main and one prep).

    that sounds wrong to me, but it sure makes my life a whole heck of a lot easier if I don't have to as the sinks are directly below windows (and a stupid number of 2x6's that the window guys put in--two extra on either side because the row of windows was not level, so rather than pulling out the wrong trimmer studs, they just added more...)

    so my questions are:
    1 - is this true?
    2 - do i need an AAV?
    3 - what kind of fitting should i use? I was thinking a san-t and then capping off the top just in case I ever had to add a vent
    4 - what size should I come out of the wall with? 1.5" or 2"?


  2. #2
    Master Plumber master plumber mark's Avatar
    Join Date
    Feb 2005
    indianapolis indiana - land of the free, home of the brave....
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    Talking yes its true.....

    that is why they sell the AAvs

    if you run 2 inch all the way up under the sink
    and then install the AAv inside the cabinet as high as
    possible, above the drain, it will work fine
    for probably 40 years..

    they are literally used about everywhere you cant
    chop the living hell out of the home...

    you need to make the aavs accssable under the sink for
    long down the road .....

    their are some regions and plumbers that frown on useing
    them but they are still sold in jsut about every hardware store
    in the USA....

  3. #3
    Plumber Cass's Avatar
    Join Date
    Nov 2005


    1.5" is in 99% of the sinks in America but if you can run 2" so much the better.

    You should go from the trap directly to a T with the AAV as high above as possible.

    That would be the best set up for the AAV.
    Last edited by Cass; 01-21-2008 at 03:42 AM.


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