Distance between plumbing vent and bathroom van exhaust

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by lojoma, Oct 22, 2013.

  1. lojoma

    lojoma New Member

    Messages:
    34
    Location:
    Tennessee
    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.
  2. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,537
    Location:
    Cave Creek, Arizona
    ideally 10 feet. And under certain conditions, even that is not enough.
  3. Terry

    Terry Administrator Staff Member

    Messages:
    14,943
    Location:
    Bothell, Washington
    Most exhaust fans have a damper on them to make them directional.
  4. lojoma

    lojoma New Member

    Messages:
    34
    Location:
    Tennessee
    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!
  5. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,949
    Location:
    New England
    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.
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