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Thread: Venting kitchen sink below window

  1. #1
    DIY Senior Member jastori's Avatar
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    Default Venting kitchen sink below window

    We have an unvented kitchen sink (old plumbing, never vented). The sink is below a window, and the nearest access for a vertical vent up is about 3-4 ft away horizontally.

    I don't think we can get 6" above fixture rim due to the window height. Is the island venting approach the best? I have seen references to the "dirty arm" approach but am not sure exactly what the details would be. I also understand AAV, but would like to avoid it if possible.

    We are in Illinois, and I will discuss the details of the approach with our plumbing inspector, but wanted to understand what the options are first.

    Thanks very much!

  2. #2
    Master Plumber Redwood's Avatar
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    You can run the drain and vent alongside the window then extend a dirty arm across to the sink.

  3. #3
    DIY Senior Member jastori's Avatar
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    Thanks very much for the quick reply.....

    Can the dirty arm go 3-4' horizontally for a 2" pipe? This is a load bearing wall, so, I am also concerned about whether I can drill for the 2" horizontal run through standard 3 1/2" studs. It would have to pass through at least 3 studs.

  4. #4
    Forum Admin, Expert Plumber Terry's Avatar
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    A 1.5" dirty arm can be 42" long, and a 2" dirty arm can be 60" long.

    Last edited by Terry; 11-02-2010 at 02:59 PM.

  5. #5
    Homeowner geniescience's Avatar
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    Can you run the pipe beside the wall for a while (inside kitchen cabinets) instead of cutting studs?

  6. #6
    DIY Senior Member dlarrivee's Avatar
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    Pretty sure sinks have been below windows for years... My kitchen sink just has a long trap arm before the tee...

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