What Size Fan Do I Need For My Bathroom

To be effective a bathroom fan needs to be powerful enough to completely replace the air in the room about 8 times every hour. A fan that s too small won t remove moisture and odors efficiently and will need to run longer increasing wear on the motor. 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.

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Simply enter the dimensions of your bathroom in the calculator below to determine the minimum size vent fan you need for the bathroom in your home.

What size fan do i need for my bathroom. Ft in the room. Learning how to calculate cfm for a bathroom fan will help you purchase the right size fan for your space. The effectiveness of the fan will be rated in cfm or cubic feet per minute of air moved. 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 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. When installing a vent fan make sure there s at least a 1 2 gap under the bathroom door to allow fresh air to enter the room when the fan is running. 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.

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