I'm building a beach home with 5 bathrooms, each is 5' wide x 9.5' long by 9' high yielding a minum CFM fan requirement of 57 CFM (for 8 changes per hour).
These showers will likley see heavy use by occupants in the humid summertime. Often there will be 2-3 showers in a row. To avoid excessive build up of humidity, I'd like to size the fan larger than the "minimum".
Is putting a 110 - 150 CFM rated bathroom fan overkill for this requirement or am I right to oversize the ventilation in this application?