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Thread: Orientation of sanitary tees in vents

  1. #1

    Default Orientation of sanitary tees in vents

    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. #2
    DIY Senior Member Fubar411's Avatar
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    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.

  3. #3
    Plumber BAPlumber's Avatar
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    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.
    Brent

  4. #4
    Moderator & Master Plumber hj's Avatar
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    Default tees

    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.

  5. #5

    Default Thanks

    Thanks for your help.

  6. #6
    DIY Senior Member construct30's Avatar
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    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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