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Old 04-24-2007, 11:29 AM   #1
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Best way to patch a duct


I need to remove an outlet from the big main heating duct (don't know what its called) out of my furnace. There is a large square hole now. Whats the best way to patch this?

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Old 04-24-2007, 02:00 PM   #2
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Best way to patch a duct


Cut a piece of ducting sheetmetal that's slightly larger than the square hole. Secure it into place using sheetmetal screws. Use ducting tape to seal the seams.

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Old 04-24-2007, 02:15 PM   #3
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Best way to patch a duct


That was my intuitive thought, but I wasn't sure if maybe there was something I hadn't considered. Thanks a lot.
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Old 04-24-2007, 02:21 PM   #4
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Best way to patch a duct


If you really want to be particular, you can also use duct caulking sealer and the foil-style duct tape....
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Old 04-24-2007, 02:45 PM   #5
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Best way to patch a duct


Yes, you can use mastic, but the ducting tape (not duct tape) should suffice, especially for a home application on a flat surface. Mastic is typically used on ducting joints where there may be more expansion and contraction due to temperature deltas when the heat kicks in.

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Old 04-25-2007, 01:51 PM   #6
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Best way to patch a duct


Clean the duct well and let it dry then a bead of sealant,metal patch,screws,and foil tape.

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