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    indy6969's Avatar
    indy6969 Posts: 1, Reputation: 1
    New Member

    Sep 16, 2010, 05:23 AM
    can I replace 12x8 cold air return duct with 12 inch flex duct in my basement?
    I need head room in my basement and want to take down the old cold air return metal duct work 12x 8 and re-route to the plenum with 12"flex duct. Will this be a problem with the furnace working properly? Please advise
    smoothy's Avatar
    smoothy Posts: 25,495, Reputation: 2853
    Uber Member

    Sep 16, 2010, 05:28 AM

    Flex duct is the last thing you should use.. it is highly restrictive compaired to rigid ducting. Besides possibly being in violations of code somepolaces (no I don't know the building codes).
    Missouri Bound's Avatar
    Missouri Bound Posts: 1,533, Reputation: 94
    Ultra Member

    Oct 1, 2010, 05:24 PM
    The 12" size is correct. Make sure you install a duct rated for return air use, reinforced to withstand the negative pressure of a return air situation.

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