Bill wrote:
My twenty year old house has cheapo ceiling exhaust fans that clang
and make all sorts of weird noises but they still work! If I were an
Engineer calculating the fastest way to exhaust "foul smelling
bathroom gases"...what kind of exhaust fan would I buy?

I would think running the fan for thirty seconds after the occurance
of foul smelling gases should be quite a sufficient amount of time for
a well planned exhaust fan to rid the bathroom of noxious odors!

Bill

Well if you want to handle it in 30 seconds, I suggest a couple of full
size whole house attic fans and don't forget you will need inlets of at
least equal area.

Rather than that, I suggest you get a good quiet exhaust fan of a size
rated for your size bath or the next size up and add a delay timer so you
can press the button and get 5, 10, 15 or 30 minutes of exhaust and then it
will turn itself off.

--
Joseph E. Meehan

26 + 6 = 1 It's Irish Math