Exhaust Fan Size For Toilet

The formula to calculate bathroom exhaust fan size reads as follows.

Exhaust fan size for toilet. For example if your bathroom is 80. 1007 rpm fan speed. The minimum requirements say that this air should be changed 15 times an hour. Here s how we get this number.

120 cfm and 1 2 sones. You multiply length times width times height. Includes built in 6w led light. Bathroom fan exhaust size calculator.

Otherwise use the appropriate calculation based on the room size. 45 watt 4 duct connector. For a standard 10ft by 10 ft bathroom with an 8 ft ceiling you will need an exhaust fan capable of 106 67 cfm. 10 feet x 12 feet x 8 feet that computes to 960 cubic feet of air in the room.

If your bathroom has a toilet or shower area enclosed by a door it s a good idea to install a separate exhaust fan for that area. If the enclosed space is small a 50 cfm fan should suffice. The tatsumaki ld 120 bathroom exhaust fan features standard size housing that fits between most ceiling joists. To arrive at your required cfm simply divide your bathroom s volume by 7 5.

But o brian suggests a simpler rule of thumb. Determine the required cfm for your bathroom fan. Cubic volume 7 5 cfm necessary. You now need to multiply 960 x 15.

A diameter of 4 inches is common for exhaust ducts but some high cfm fans fit a 6 inch diameter duct. For example a bathroom with a volume of 1000 cubic feet 28 3 cubic meters needs a fan capable of moving 1000 7 5 or 133 cfm 3 8 cubic meters per minute. 10ft 10ft 8ft 7 5 106 67 cfm. An effective bathroom fan should be capable of replacing the entire volume of air 8 times per hour or every 7 5 minutes.