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  1. #1
    Join Date
    Jul 2002
    Posts
    79
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    Duct in Exterior Walls

    Is it acceptable to run 6" oval supply duct in exterior walls or is there a problem with it - insulation or other wise?

    Thank You,

  2. #2
    Join Date
    Jan 2004
    Location
    PA
    Posts
    70,007
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    Unfortunately, its done.
    Worse place to put it.
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    How-to-apply-for-Professional

    How many times must one fix something before it is fixed?

  3. #3
    Join Date
    Feb 2007
    Location
    18951
    Posts
    1,593
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    If it's for heating, you could lose a lot out the wall. If it's for cooling, and touches the wall, you could ruin it eventually. If it's the only place you can run it, I'd recommend spray foam between the duct and wall.

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