You misunderstood. I'm talking about the exhaust area in the attic. You're
"open a window" idea only works if you happen to have a window in your
attic. I do have one house that has one, but it's not 10 sq. ft.

s



"AZ Nomad" wrote in message
...
On Wed, 30 Jan 2008 19:15:47 -0600, S. Barker
wrote:
That really is the main consideration. A 30" fan requires TEN square feet
of exhaust to function to maximum. When you get to figgering vent space,
that's quite a bit. And if the fan gets bigger, then the exhaust area
multiplies accordingly.

open a ****ing window.