My house is covered by sheet metal and I currently have a 4 in. vent hole from a previous air exchanger. I'm changing the air excahnger and require a 5 in. hole. So I basically have to make a hole though a sheet of metal and 4 in. wood through the house to enlarge the previous hole. It seems I can't do this with an hole saw. How can I do this on a busget and how profissional actually do this?
Walls – How to enlarge a 4 in. vent hole on exterior wall
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Best Answer
Buy a 5" holesaw (and a drill sturdy enough to drive it). Cut a 5" hole in a big chunk of plywood. Screw/nail/clamp the plywood in the place where you want the hole. Drill away.
If you're having a hard time with the drill binding and trying to twist your wrist off, run it in reverse. It's much slower, but you won't have the same problem.
Couple more tips: Once you've started the cut, drill a few 1/4" holes in the cut ring to help clear sawdust. Pull the holesaw out regularly to clear the sawdust that collects on the teeth.