What Size Bathroom Fan Do I Need

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What size bathroom fan do i need. Sizing for large bathrooms for bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room. Use the room size to determine the necessary cubic feet per minute cfm rating of the fan. The cfm rating measures the volume of air the fan moves.

A fan that s too small won t remove moisture and odors efficiently and will need to run longer increasing wear on the motor. Learning how to calculate cfm for a bathroom fan will help you purchase the right size fan for your space. A large bathroom with a jetted tub a toilet and a shower a common configuration in new homes would need a 200 cfm ventilation fan such as the broan l200 ventilation fan available from.

This guide will help you understand how to choose the right size and type of bathroom fan. To be effective a bathroom fan needs to be powerful enough to completely replace the air in the room about 8 times every hour. 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.

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. Bathroom fans improve indoor air quality by venting moist air quickly outside which eliminates problems associated with high humidity like mold and mildew growth steamy mirrors and peeling wallpaper and paint.