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Thread: Distance between plumbing vent and bathroom van exhaust

  1. #1
    DIY Member lojoma's Avatar
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    Default Distance between plumbing vent and bathroom van exhaust

    Is there a minimum distance between where the sink vent goes through the roof and where a bath fan exhaust goes through the roof?

    Seems if they are too close you could get sewer gas coming back through the bath fan. I did a search but couldn't find this specifically.
    John Mark

  2. #2
    Moderator & Master Plumber hj's Avatar
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    ideally 10 feet. And under certain conditions, even that is not enough.
    Licensed residential and commercial plumber

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    Forum Admin, Expert Plumber Terry's Avatar
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    Most exhaust fans have a damper on them to make them directional.

  4. #4
    DIY Member lojoma's Avatar
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    Thanks for the replies. Would bath fan venting out the wall rather than the roof make a difference?
    I figured the damper isn't the most reliable thing for this intent. If I'm incorrect let me know. Thanks!
    John Mark

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
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    The vent's gasses tend to rise, but the wind can make it go anywhere. When the bathroom exhaust fan isn't running, if the damper isn't perfect, I suppose it could leak, but the gasses in still are tend to not do that. It somewhat depends on what you're using for a roof vent termination for the fan. Some of them also have a damper in them, and then with the two, it would be much harder to get any fumes down there. You need something for the bathroom vent on the roof to keep out snowmelt or rain, or condensation from dripping back down the duct.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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