Re: Bathroom exhaust fan installation



On Sat, 9 Feb 2008 13:13:58 -0500, "EXT" <noemail@xxxxxxxxxxxxxxxxxxx>
wrote:

I'll be buying 4" aluminum ducting so when I buy a hole saw to cut the
roof hole do I buy one that's 4" round, 4 1/4", or 4 1/2"?

Anything else I should do or watch out for?

Thanks.
Walter

For size measure the flange on the vent fitting you will be using on the
roof and add about a 1/4 to 3/8 to allow the clamp to fit into the hole.

I would not use a hole saw to cut through the roof. The tar in the shingles
will grab the hole saw of that size and tear the tool out of your hands, the
grit in the shingles will destroy the teeth on the hole saw.

The hole saw I used looked fine after I used it. I had no problems at
all drilling from the bottom. I think I bought 4.5, but I'd have to
dig it out to be sure.




.



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