Bathroom exhaust fan placement. Glass area with a minimum 15-sq-ft. Opening IRC 2009 3033. Route the Bathroom Fan to the Exterior. Ive replaced lots of this style broan fan and they are very popular.
Each bathroom shall be mechanically ventilated and shall comply with the following. By placing the fan as shown in the picture the steam will be easily exhausted out of the house and fresh air will be drawn in from the gap under the door. If you are using the exhaust fan with light and heater then dont place it near the shower. You might be wondering what the last point means. This is usually the area over the bathtub or showerThe goal of the exhaust fan is primarily to remove wet humid air that can cause mold or moisture damage and your bathroom will exhaust most quickly if you position the fan over the area where there.
Make sure the vent fan moves enough cubic feet per minute CFM of air for the size of your bathroom. Typically fresh air can enter the room via a gap under the door the typical recommendation is a 20mm gap.
What you want to avoid is a cheap exhaust fan known in the building trades as a fart-fan. A loud bathroom exhaust fan venting can make a relaxing shower well not so relaxing. Gather your flexible ducting and take it back into the attic. Glass area with a minimum 15-sq-ft. Purchased a super quiet Panasonic exhuast fan. The walls outside the tub are not.