Drill pilot holes through the screw holes on the wall cap and through the mounting block siding and wall.
Cut hole through wall with aluminum siding.
Apply a thick bead of silicone adhesive.
Use a nibbler to cut in a straight line.
Cut across the contours of the aluminum siding with a radial arm saw.
While cutting at the width of the aluminum siding make use of straight tin snips.
6 pull the wall cap and duct out of the wall.
It may not be an obvious choice but fitted with the right blade a circular saw is a great metal cutting tool.
Assuming you ve got access from below to the joist space you can use tin snips also called aviation snips to cut the siding and a hole saw or reciprocating saw sabre saw or sawzall to cut.
Here s one that claims to come with a circle cutting attachment for 15.
Use the panel to reduce the risk of snags while cutting.
Cut hole in aluminum siding for bathroom vent fan my house has aluminum siding.
In our test it cut through rebar like a hot knife through butter.
If your perimeter holes touch the circle you drew then your cutting the hole will be that much easier.
I have an ancient dewalt 660 with a circle cutting attachment.
Cut metal with your circular saw.
When using a hole saw to drill the hole in aluminum siding keep the saw slightly tilted to one side to reduce the chances that the hole saw will bind while cutting the hole.
Step 2 cut the width.
Thick using a ferrous metal cutting blade.
Remember that any imperfections to your cutting will be covered by the thimble.
It s basically a smallish router and used all the time for cutting holes in drywall shower walls etc.
You can cut mild steel up to about 3 8 in.
I want to install a bathroom vent fan that vents to the exterior of the house straight through the wall.
Tons of companies make similar tools.
Hot metal chips will fly everywhere.
Sometimes called a spiral saw or rotary cutting tool.