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  1. #1
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    Default dryer duct construction

    In the 2006 IRC, where it says that clothes dryer duct joints should run in the direction of air flow, that means the male ends should be pointing in the direction of air flow so lint doesn't get caught, right?

    I keep seeing it done backwards, so just checking.

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  2. #2
    Ray Norton's Avatar
    Ray Norton Guest

    Default Re: dryer duct construction

    Yes that is exactly what IRC G2439.5 says: "The male end of the duct at overlapped duct joints shall extend in the direction of airflow." But, since the reason is not stated in the code, we can only guess why, and lint could be 1 of several reasons.



  3. #3
    Luigi NI's Avatar
    Luigi NI Guest

    Default Re: dryer duct construction

    exhaust gases need to stay in the vent pipe until it gets outside


  4. #4
    James Duffin's Avatar
    James Duffin Guest

    Default Re: dryer duct construction

    If I see metal duct and not the flexible vinyl or metal material I usually let it slide. Also the joints are usually taped so you can't tell which way the joints face anyways.


  5. #5
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    Default Re: dryer duct construction

    Quote Originally Posted by James Duffin View Post
    If I see metal duct and not the flexible vinyl or metal material I usually let it slide. Also the joints are usually taped so you can't tell which way the joints face anyways.
    This was new construction with no dryer hooked up, so I could easily look down the duct inside the wall and see the male end up at the first joint.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
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  6. #6
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    Default Re: dryer duct construction

    Quote Originally Posted by Luigi NI View Post
    exhaust gases need to stay in the vent pipe until it gets outside
    Not sure what that has to do with the duct joint direction.

    "There is no exception to the rule that every rule has an exception." -James Thurber, writer and cartoonist (1894-1961)
    www.ArnoldHomeInspections.com

  7. #7
    James Duffin's Avatar
    James Duffin Guest

    Default Re: dryer duct construction

    Quote Originally Posted by John Arnold View Post
    This was new construction with no dryer hooked up, so I could easily look down the duct inside the wall and see the male end up at the first joint.
    Good way to look and see what's going on!


  8. #8
    Join Date
    Oct 2010
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    Default Re: dryer duct construction

    John
    That is correct. It is to stop lint from collecting and that is also the reason for not allowing any fasteners to penatrate it.


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