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  1. #1
    Join Date
    Jul 2008
    Posts
    4

    Talking Combining Batroom Exhasut Vent w/Existing Vent

    I would like to remove a 4" dryer type hose venting that runs to the gable vent and tie it into the existing PVC vent stack that goes through the roof. The PVC vent stack is much closer to the bathroom exhaust fan and I think it would more efficent. Are there any issues with tying these two together?

  2. #2
    Join Date
    Aug 2007
    Location
    The Great White North
    Posts
    4,045

    Default Re: Combining Batroom Exhasut Vent w/Existing Vent

    Are there any issues with tying these two together?
    1 - the main plumbing vent stack also exhausts methane gas.
    Tying the bathroom fan into this will allow an avenue for that sewer gas entering the home.

    2 - the other function to allow air in for the drain system to function properly.
    If you are pushing air out while there is a need for air in the drains you can have vacum locks and poor functioning drains.

    I'd recommend leaving the vent stack alone to function as intended .

    2 cents worth.
    "" an ounce of perception -- a pound of obscure "
    - Rush

  3. #3
    Join Date
    Aug 2007
    Posts
    7,081

    Default Re: Combining Batroom Exhasut Vent w/Existing Vent

    You definitely don't want to tie the two together, aside from the toxic gases coming into the room you'll also be getting sewer odors. What you can do is vent the bath through it's own roof penetration, the only caveat to this is if you live in cold climates the vertical vent could be prone to icing and freezing from the damp air being vented from the bathroom or possibly being covered by snow.
    I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!

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