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EERE » BTO » Building America » Solution Center Home » Image Gallery » Right – A contractor installs mastic in branch duct take offs to air seal the seams where they attach to the trunk duct.

Right – A contractor installs mastic in branch duct take offs to air seal the seams where they attach to the trunk duct.

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Right – A contractor installs mastic in branch duct take offs to air seal the seams where they attach to the trunk duct.

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