Bathroom Fan Size

For example a 10 wide by 15 long bathroom with a 10 ceiling would need.

Bathroom fan size. Suggested cfm for the bathroom is based on cycling all the air in the bathroom 8 times per hour. Just add up the numbers below that correlate with each fixture in your bathroom to determine the appropriate fan size for the space. 50 cfm shower.

Enter bathroom height step 4. 10ft 10ft 8ft 7 5 106 67 cfm bathroom fan exhaust size calculator. Press calculate minimum suggested bath fan cfm.

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. 50 cfm standard bathtub. Sizing for large bathrooms for bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room.

For a standard 10ft by 10 ft bathroom with an 8 ft ceiling you will need an exhaust fan capable of 106 67 cfm. A fan that s too small won t remove moisture and odors efficiently and will need to run longer increasing wear on the motor. If your bathroom has a higher ceiling multiply the width x length x height of the room divide by 60 minutes in an hour then multiply by 8 number of air exchanges per hour.

Enter bathroom width ft. A 50 square foot or smaller bathroom needs a 50 cfm fan. 1500 60 25.

Enter bathroom length ft. For bathrooms between 50 and 100 square feet estimate approximately 1 cfm per square foot. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom.