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  1. #1
    Join Date
    Mar 2007
    Location
    Chicago, IL
    Posts
    2,797

    Default When you are asked "wye" not?

    Where can I find a good discussion of the specification of "wyes" as opposed to "tees" for gas appliance venting? I want to cover every possible base on this little beauty:

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    Michael Thomas
    Paragon Property Services Inc., Chicago IL
    http://paragoninspects.com

  2. #2
    Join Date
    Mar 2007
    Location
    Oregon
    Posts
    2,365

    Default Re: When you are asked "wye" not?

    I can't help with your question but something I do in that scenario is line up the vent pipe with the chimney's mortar joints in your photo (assuming they're level) and it gives a great point of reference to see just how bad the lack of any slope is.


  3. #3
    James Duffin's Avatar
    James Duffin Guest

    Default Re: When you are asked "wye" not?

    The main reason I see to use a wye over a tee is to cut down on the amount of restriction in the vent system. Below is an excerpt from the Duravent manual.


    COMPENSATING FOR EXTRA ELBOWS
    For single appliance venting configurations, Tables I and II,
    a zero lateral length is assumed to have no elbows in the
    vent system. For vent configurations that do have lateral
    lengths, the capacities shown in the tables assume that the
    vent system has the equivalent of two 90 elbows, which
    may be located at any position in the vent system. The
    system could have:
    A. Two 90 elbows.
    B. One 90 elbow and one tee.
    C. Four 45 elbows.
    D. Two 45 elbows and one tee.
    When more than two 90 elbows are required in the
    venting system, the maximum capacity listed in the venting
    tables should be reduced by 10% (0.90 x maximum listed
    capacity) for each additional 90 elbow, or equivalent.
    Please note that 90 elbows are only allowed in the same
    space as the appliance and are not permitted above the
    ceiling.
    Figure 54.
    Length of Lateral
    (L)
    Total Vent
    Height (H)



  4. #4
    Join Date
    Mar 2007
    Location
    Chicago, IL
    Posts
    2,797

    Default Re: When you are asked "wye" not?

    Thanks to you both.

    Michael Thomas
    Paragon Property Services Inc., Chicago IL
    http://paragoninspects.com

  5. #5
    James Duffin's Avatar
    James Duffin Guest

    Default Re: When you are asked "wye" not?

    I'm not sure what happened there....sorry!


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