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J187 04-24-2007 10:29 AM

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?

handy man88 04-24-2007 01:00 PM

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.

J187 04-24-2007 01:15 PM

That was my intuitive thought, but I wasn't sure if maybe there was something I hadn't considered. Thanks a lot.

AtlanticWBConst. 04-24-2007 01:21 PM

If you really want to be particular, you can also use duct caulking sealer and the foil-style duct tape....

handy man88 04-24-2007 01:45 PM

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.

mikemy6 04-25-2007 12:51 PM

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

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