Lenox is also very good but as I said in another post..
You do not need Bi-Metal blade to to cut thin sheet metal...
But you do need the correct speed most hand drills run at 700+ RPMs
that is the correct speed for a 1/2" drill..
Your fan hole is about 3" so you what 1/6 of 700 RPMs say 100 RPMs..
If you bump the trigger every few seconds is your best bet..
The type hand drill you really want is a right angle drill used mostly by plumbers and runs slower...
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