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Thread: Round Pipe..

  1. #1
    Join Date
    Jan 2005
    Posts
    109
    Do anyone use the round pipe for a/c ducts in the attic? Easier to use than rect. duct?

  2. #2
    Join Date
    Nov 2001
    Posts
    1,874
    Rectangular duct is used to deliver air to the round ducts,
    round ducts deliver the air to the registers.

    The only time I have seen rect duct used to supply the air to the register is in commercial work.

    Rect duct costs more.

    But anything is possible in this line of work,
    If you try to fail, and succeed.
    Which have you done ?



  3. #3
    Join Date
    Jan 2005
    Posts
    109
    round pipe is used directly off the plenum. Then round flex to the registers off of the round duct.

  4. #4
    Join Date
    Jan 2004
    Location
    PA
    Posts
    68,773
    Round trunk isn't common in my area, Lanc, PA.

    But I can't see why there would be any thing wrong with doing it that way.

    Sizing is more important then shape.
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  5. #5
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579


    A section of straight smooth round duct has less resistance than a straight section of rectangular duct of the same cross sectional area.


  6. #6
    Join Date
    Sep 2002
    Location
    South Dakota
    Posts
    6,579


    An excellent and inexpensive book on duct systems and airflow is "Airflow In Ducts" by Leo Meyer available at http://www.lamabooks.com

    Easy to understand and right to the point. One of the most clearly written books on the topic I have ever seen in my 34 years in this business.


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