Exhaust Fan Size For Toilet

A diameter of 4 inches is common for exhaust ducts but some high cfm fans fit a 6 inch diameter duct.

Exhaust fan size for toilet.

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. The tatsumaki ld 120 bathroom exhaust fan features standard size housing that fits between most ceiling joists. Cubic volume 7 5 cfm necessary. For example if your bathroom is 80.

For bathrooms less than 100 square feet you can just go with 1 cfm for every square foot of floor area he says. To arrive at your required cfm simply divide your bathroom s volume by 7 5. For a standard 10ft by 10 ft bathroom with an 8 ft ceiling you will need an exhaust fan capable of 106 67 cfm. Determine the required cfm for your bathroom fan.

Bathroom fan exhaust size calculator. You multiply length times width times height. 10ft 10ft 8ft 7 5 106 67 cfm. 45 watt 4 duct connector.

The minimum requirements say that this air should be changed 15 times an hour. You now need to multiply 960 x 15. 10 feet x 12 feet x 8 feet that computes to 960 cubic feet of air in the room. If the enclosed space is small a 50 cfm fan should suffice.

Otherwise use the appropriate calculation based on the room size. But o brian suggests a simpler rule of thumb. Check the size of the exhaust port on the fan to make sure it fits your ductwork if applicable. 120 cfm and 1 2 sones.

Here s how we get this number. An effective bathroom fan should be capable of replacing the entire volume of air 8 times per hour or every 7 5 minutes. Double hanger bar system for ideal positioning. The formula to calculate bathroom exhaust fan size reads as follows.