How To Patch Sheet Metal Ductwork

So what we re going to do is we re going to take a piece of scrap sheet metal.

How to patch sheet metal ductwork.

For a fiberboard duct secure the patch with a strip of foil tape along each side. Set the cut piece of 26 ga sheet metal against the side of the ductwork and run a 10 self tapping sheet metal screw into one corner of the metal patch if you are installing the patch on metal ductwork. Assemble the metal ducting like a zipper when assembling pipe start at one end and work the seam together like a zipper. In this video we show you the best and safest way to cut a round hole into a can or rectangular duct.

Two inch 3 inch and 4 inch widths are common. Now this is just a piece of a duct that i just bent and it s the same material that the ductwork is made out of. Tape cracks or holes larger than 1 8 inch diameter with the tape selected. Wherever there s a joint or intrusion use sealant.

If you are installing the metal patch on fiberboard ductwork place a length of metal foil tape on each side of the metal patch to secure it to the ductwork. Place the repair sheet metal over the damaged area. For smaller holes apply mastic like caulk. A thin sheet metal patch can also be cut to fit the hole with sheet metal shears.

Hold firmly in place and drill the appropriate size hole through both layers of metal using a drill fitted with the required size drill bit for. Use one hand to keep the two edges close and the other to apply downward pressure. Seal all the duct joints holes and connections near the furnace. Choose the width that.

Seal the duct to register connection as well. The patch is screwed into place with. Finally run a bead of silicone caulk around the edges of the patch to prevent air leaks. Use your leg a workbench or the ground to support the back side of the pipe.

Cover with the mastic to create a durable duct patch. There are several widths of tape to choose from.