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Old 10-06-2012, 07:40 PM   #29
troidus
Beastly Adventurer
 
Joined: Sep 2010
Oddometer: 12,056
I would add that you want to mark your vent location from inside the attic so you don't accidentally put your hole saw through a rafter. I drilled a small hole from the inside, then used the hole saw from the outside. I suppose you could do the whole thing from the inside, but I wanted to watch the felt when the saw hit it to make sure it cut, rather than tore.
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