How To Patch Sheet Metal Ductwork

Finally run a bead of silicone caulk around the edges of the patch to prevent air leaks.

How to patch sheet metal ductwork.

Two inch 3 inch and 4 inch widths are common. You ll need a drill sheet metal snips a start collar. The patch is screwed into place with. Cover with the mastic to create a durable duct 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. Seal the duct to register connection as well. A thin sheet metal patch can also be cut to fit the hole with sheet metal shears. For a fiberboard duct secure the patch with a strip of foil tape along each side.

Use your leg a workbench or the ground to support the back side of the pipe. 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. Assemble the metal ducting like a zipper when assembling pipe start at one end and work the seam together like a zipper. What we re going to do is cut this close to the right length and we re going to seal it up with some mastic and screw it down with these self tapping screws.

In this video we show you the best and safest way to cut a round hole into a can or rectangular duct. There are several widths of tape to choose from. Seal all the duct joints holes and connections near the furnace. Tape cracks or holes larger than 1 8 inch diameter with the tape selected.

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. 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. 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.

Choose the width that. For smaller holes apply mastic like caulk.