Thanks guys.
The template is available on the net, as are the instructions. It's pretty straight forward. Once the test fitting of the template to a duct is confirmed, there's not much to do other than tape, position, drill, mark, and (gulp!) cut. I undersized the template by about 3/16", opting to finish with a small drum sander on a Dremel. It's dustier, but I felt safer doing it that way. Didn't feel like getting into a "I cut, and cut, and cut, but it's still too short!" scenario. All in all, the template is very accurate. I checked when the final holes were done, and they pretty well matched up with the template.
I've attached the template here, in case someone wants to do theirs. The webpage instructions are included as well.
The template is available on the net, as are the instructions. It's pretty straight forward. Once the test fitting of the template to a duct is confirmed, there's not much to do other than tape, position, drill, mark, and (gulp!) cut. I undersized the template by about 3/16", opting to finish with a small drum sander on a Dremel. It's dustier, but I felt safer doing it that way. Didn't feel like getting into a "I cut, and cut, and cut, but it's still too short!" scenario. All in all, the template is very accurate. I checked when the final holes were done, and they pretty well matched up with the template.
I've attached the template here, in case someone wants to do theirs. The webpage instructions are included as well.