What Size Cfm Exhaust Fan For Bathroom

So if you have a bathroom that is 12 feet long 15 feet wide and 10 feet tall then it has a volume of 1800 cubic feet 12 x 15 x 10 and a cfm of 240.

What size cfm exhaust fan for bathroom.

Sizing for large bathrooms for bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room. Press calculate minimum suggested bath fan cfm. Here s how we get this number. Enter bathroom length ft.

Determine the size of your bathroom with this formula. A fan s ability to move air is measured in cubic feet per minute cfm. Ft in the room. The result is the cfm or cubic feet per minute rating required for your bathroom fan.

Suggested cfm for the bathroom is based on cycling all the air in the bathroom 8 times per hour. Enter bathroom width ft. Cubic volume 7 5 cfm necessary. Enter bathroom height step 4.

Bathroom fan exhaust size calculator. Toilet 50 cfm shower stall 50 cfm whirlpool 100 cfm 200cfm bathroom exhaust fan. For example if your bathroom is 80 square feet you ll need an 80 cfm fan such as the broan smartsense 80 cfm ventilation fan available from supplyhouse. The formula to calculate bathroom exhaust fan size reads as follows.

Learning how to calculate cfm for a bathroom fan will help you purchase the right size fan for your space. Bathroom vent fans are rated by the cubic feet per minute cfm of air they move and should be sized to replace the air in the room at least eight times an hour. Bathroom vent fans serve an important function by removing humid air from your home to prevent mold and mildew from forming. If your bathroom has an 8 ceiling the cfm rating for your fan should be as least as high as the number of square feet 5 x 7 35 sq.

For a standard 10ft by 10 ft bathroom with an 8 ft ceiling you will need an exhaust fan capable of 106 67 cfm. Building code does not specify bathroom vent locations but in any size bathroom it is the most logical to install it over or as close as possible to the plumbing fixture that requires it. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom. Vent fans are rated by the number of cubic feet of air they move per minute cfm and it s important to buy a large enough fan for the size of your bathroom.

A fan should have a cfm rating high enough to replace the air in your bathroom at a rate 8 times per hour. 10ft 10ft 8ft 7 5 106 67 cfm. The bigger your bathroom the higher the cfm rating you ll need. The minimum allowed fan size is 50 cfm so if your bathroom is for example only 42 square feet you still need a 50 cfm fan.