Orientation of sanitary tees in vents

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by JimV, Jan 10, 2008.

  1. JimV

    JimV New Member

    Jan 10, 2008
    Should sanitary tees be installed in vent systems so that they facilitate air flowing down towards the waste pipes, or upward to allow air to flow easily out of the system? Thanks.
  2. Fubar411

    Fubar411 New Member

    Nov 15, 2007
    St Louis, MO
    I'm no plumber, but I've been told it is to show the next guy it is a vent. But it also aids the water to drail if rainfall gets in there or there is condensation.
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  4. BAPlumber

    BAPlumber Plumber

    Jul 18, 2007
    Journeyman Plumber, business owner
    Vashon, Washington
    vents must slope towards a drain, so whether on a stack or on a horizontal, the fitting must slope to the drain. It's more about water than air.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona

    By convention, and to make inspectors happy, they are usually installed inverted, but as a practical matter air is a gas and thus does not need "sweep" fittings to help its flow.
  6. JimV

    JimV New Member

    Jan 10, 2008

    Thanks for your help.
  7. construct30

    construct30 New Member

    Jun 16, 2007
    NorthWest PA
    I was told the answer to this questin is "yes". Do whatever the inspector likes and don't waste time worrying. I usually run them like drains for water to run. HJ is right air will move regardless, water alone will go down without issue really either way too.

    I don't think for most of us it is a code issue, but it might be for some.
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