How To Patch Sheet Metal Ductwork

In this video we show you the best and safest way to cut a round hole into a can or rectangular duct.

How to patch sheet metal ductwork. You ll need a drill sheet metal snips a start collar. There are several widths of tape to choose from. Seal the duct to register connection as well. 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. Two inch 3 inch and 4 inch widths are common. 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. So what we re going to do is we re going to take a piece of scrap sheet metal.

For a fiberboard duct secure the patch with a strip of foil tape along each side. Tape cracks or holes larger than 1 8 inch diameter with the tape selected. Choose the width that. For smaller holes apply mastic like caulk.

Use one hand to keep the two edges close and the other to apply downward pressure. Wherever there s a joint or intrusion use sealant. Seal all the duct joints holes and connections near the furnace. The patch is screwed into place with.

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. If you re patching a sheet metal duct use a power screwdriver to drive a 10 self tapping sheet metal screw into each corner of the patch. 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. A thin sheet metal patch can also be cut to fit the hole with sheet metal shears.

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. Place the repair sheet metal over the damaged area.