Tape cracks or holes larger than 1 8 inch diameter with the tape selected.
How to patch sheet metal ductwork.
The patch is screwed into place with.
Wherever there s a joint or intrusion use sealant.
Seal all the duct joints holes and connections near the furnace.
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.
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.
There are several widths of tape to choose from.
Two inch 3 inch and 4 inch widths are common.
For a fiberboard duct secure the patch with a strip of foil tape along each side.
Place the repair sheet metal over the damaged area.
A thin sheet metal patch can also be cut to fit the hole with sheet metal shears.
Use your leg a workbench or the ground to support the back side of the pipe.
So what we re going to do is we re going to take a piece of scrap sheet metal.
Cover with the mastic to create a durable duct patch.
In this video we show you the best and safest way to cut a round hole into a can or rectangular duct.
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.
Finally run a bead of silicone caulk around the edges of the patch to prevent air leaks.
Seal the duct to register connection as well.
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.
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.