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  1. #1
    mathew stouffer's Avatar
    mathew stouffer Guest

    Default Metal duct near crawl space floor

    The home was remodeled in 04. This duct was about 2 inches off the ground. Is the clearance requirement 6? I know they spared no exspense on the support.

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  2. #2
    Join Date
    Mar 2007
    Location
    Columbus GA
    Posts
    3,746

    Default Re: Metal duct near crawl space floor

    M1601.3.2 Support.
    Metal ducts shall be supported by

    1
    /2-inch (13 mm) wide 18-gage metal straps or 12-gage galvanized
    wire at intervals not exceeding 10 feet (3048 mm)

    or other approved means.
    M1601.3.4 Duct insulation.
    Duct insulation shall be
    installed in accordance with the following requirements:
    1. A vapor retarder having a maximum permeance of
    0.05 perm [(2.87 ng/(s m
    2 Pa)] in accordance with
    ASTM E 96, or aluminum foil with a minimum thickness
    of 2 mils (0.05 mm), shall be installed on the
    exterior of insulation on cooling supply ducts that
    pass through nonconditioned spaces conducive to
    condensation.
    2. Exterior duct systems shall be protected against the

    elements.

    M1601.3.6 Duct separation.
    Ducts shall be installed with
    at least 4 inches (102 mm) separation from earth except

    where they meet the requirements of Section M1601.1.2.

    M1601.1.2 Underground duct systems


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  3. #3
    David Argabright's Avatar
    David Argabright Guest

    Default Re: Metal duct near crawl space floor

    I can't remember how many metal ducts I've seen rusted from being on or close to the crawl space floor. None of them were properly supported. They use duct tape and coat hangers. Same thing with the flexable ducts...except with severe bends.


  4. #4
    Join Date
    Jul 2008
    Location
    Utah
    Posts
    389

    Default Re: Metal duct near crawl space floor

    Quote Originally Posted by David Argabright View Post
    I can't remember how many metal ducts I've seen rusted from being on or close to the crawl space floor. None of them were properly supported. They use duct tape and coat hangers. Same thing with the flexable ducts...except with severe bends.

    Well duct tape for support is not good but a wire hanger looks like it might meet code. Of course it depends on how it's installed . . . .

    jus sayin.


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