Hi - first-time poster here. I searched my question and didn't find the topic addressed previously.
My bathroom has a 70 CFM fan, but it's 122 cubic feet (10'10" ceilings in a 8.5'x10' room). Is it acceptable to add a second 70 CFM fan, or do we need one 130+ CFM unit?
I am remodeling an old 2 story house, and am installing 4 baths, 2 up and 2 down, 2 above the other 2. I want to install only 1 fan for all 4 baths, in the attic. Is this practical? If so, what size fan and motor should I look for? I'm thinking of venting it thru the roof, before I have the...