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  1. #1
    Jeff Eastman's Avatar
    Jeff Eastman Guest

    Default Restricted, crimped air ducts?

    Last edited by Jeff Eastman; 12-19-2007 at 05:56 PM.
    Elite MGA Home Inspector E&O Insurance

  2. #2
    Join Date
    May 2007
    Location
    Frankfort, KY
    Posts
    326

    Default Re: Restricted, crimped air ducts?

    Jeff,

    It wouldn't be a bad idea to recommend that they have the static pressure of the duct system tested to verify proper airflow.

    Any equipment attached to a duct system like that is in for a rough run.

    Measured Performance more than just a buzzword

  3. #3
    Join Date
    May 2007
    Location
    Frankfort, KY
    Posts
    326

    Default Re: Restricted, crimped air ducts?

    If you need a contractor in Vegas that does performance testing I can hook you up Jeff.

    One of the guys who mentored me lives in Vegas.

    Measured Performance more than just a buzzword

  4. #4
    Joseph Rago's Avatar
    Joseph Rago Guest

    Wink Re: Restricted, crimped air ducts?

    As a rule, flexible ductwork should not be installed in lengths greater than 8 feet, and with a bend greater than 90 degrees. One could test for "static pressure", but where? Suggest testing for volume delivered at each outlet for a more definitive result.

    Joseph D. Rago P.E.
    A.E.G.
    Yardley PA


  5. #5
    Join Date
    May 2007
    Location
    Frankfort, KY
    Posts
    326

    Default Re: Restricted, crimped air ducts?

    You could test the total external static pressure to see how much resistance the fan is seeing & you could also measure the static pressure drop of each suspect flex run out.

    Most guys can afford a manometer or magnehelic, most don't have anyway of measuring air volume from the registers.

    Measured Performance more than just a buzzword

  6. #6
    Join Date
    Mar 2007
    Location
    Ormond Beach, Florida
    Posts
    25,317

    Default Re: Restricted, crimped air ducts?

    Quote Originally Posted by Joseph Rago View Post
    As a rule, flexible ductwork should not be installed in lengths greater than 8 feet,
    Where is that information from?

    Would like to read it.

    I know that flexible "air connectors" are not allowed longer than 14 feet, but "flexible duct" length is unlimited.

    Thanks.

    Jerry Peck, Construction / Litigation Consultant
    Construction Litigation Consultants, LLC ( www.ConstructionLitigationConsultants.com )
    www.AskCodeMan.com

  7. #7
    Join Date
    Oct 2003
    Location
    Rockwall Texas
    Posts
    4,517

    Default Re: Restricted, crimped air ducts?

    Why not install saddles below the ducts where the strap is restricting the air flow?


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