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  1. #1
    Join Date
    Feb 2008
    Location
    Tennessee
    Posts
    105

    Default HVAC Ducts To Garage

    Just finished one of the McKissock CE courses and read in one of them that HVAC system cannot supply conditioned air to a garage due to the risk of fumes venting back into living quarters through these vents. (this was in the cross-connection course) I did not know this and have seen it done in a few homes over the ten years I have been at this. Does anyone know of a legit code stating that this is not allowed?

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  2. #2
    Join Date
    Mar 2007
    Location
    Plano, Texas
    Posts
    4,170

    Default Re: HVAC Ducts To Garage

    IRC R309
    Garages and Carports

    R309.1 Opening protection. Openings from a private garage directly into a room used for sleeping purposes shall not be permitted. Other openings between the garage and residence shall be equipped with solid wood doors not less than 1 3/8 inches in thickness, solid or honeycomb core steel doors not less than 1 3/8 inches thick, or 20-minute fire-rated doors.
    R309.1.1 Duct penetration. Ducts in the garage and ducts penetrating the walls or ceilings separating the dwelling from the garage shall be constructed of minimum no. 6 gage sheet steel or other approved material and shall have no openings into the garage.

    This is copied from the 2003 IRC but I don't think it has changed in later editions. Underlining is mine.

    Jim Luttrall
    www.MrInspector.net
    Plano, Texas

  3. #3
    Join Date
    Feb 2008
    Location
    Tennessee
    Posts
    105

    Default Re: HVAC Ducts To Garage

    Thanks Jim, I will be calling these out in the future.


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