Bathroom exhaust fan hole too big. If the enclosed space is small a 50 CFM fan should suffice. I cant imagine that will be very pretty. But the hole is too big. Sun Mar 9 2014 208 AM. I purchased a Nutone exhaust fan today that specifies a six inch duct.
If that doesnt help its probably time for a new fan. I have 2×8 joists and am thinking the 6 hole is probably too big of a hole but Im no expert. Aug 2 2017. Just remember that the fan needs airflow to do its job.
I need to install an exhaust fan in my basement bathroom. If you notice that the new fan is either too big or too small for the hole youll have to do some finagling. Attach the drywall filler to a larger piece of wood.
The next step is to fit the wire connection from the attic. I need to install an exhaust fan in my basement bathroom. Sizing Your Bathroom Fan. Small fans can ventilate a space for 79 square feet or less while medium fans are best for 70 to 100 square foot areas. Timersollution and a cheap one at that. Route the Bathroom Fan to the Exterior.