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Bath fan

Posted by JT on October 21st, 1997 01:02 PM
In reply to bathroom exhaust by tom on October 20th, 1997 09:48 PM [Go to top of thread]

tom, venting into the attic is a bad idea and against
most (probably all) model building codes. If you don't
want to go through your ceiling, maybe a through-the-wall
model would work for you.
I believe the minimum volume called for by the UBC is
5 air changes per hour, but 8 is more commonly used.
The volume of your bathroom is 600 cu. ft., so
(600 x 8)/60 = 80 cfm. I think Panasonic makes a 90
cfm. (check You should be aware that
bath fans don't have a lot of power behind them, so
you need to keep ducting as short as possible, and
make all bends as gradual as possible. If your duct
path gets nasty, you will have to go to a larger model
to get the cfm you need.

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