Cfm Requirements For Bathroom Fans

For bathrooms between 50 and 100 square feet estimate approximately 1 cfm per square foot.

Cfm requirements for bathroom fans. The exhaust fan removes moisture and humidity from your bathroom. Add an extra 100 cfm if your bathroom sports a jetted tub to compensate for the additional moisture. Learn more exhaust fan options by feature.

Enter bathroom width ft. Fans to eliminate odor humidity and other air borne pollutants that affect indoor air quality. 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.

Enter bathroom length ft. Press calculate minimum suggested bath fan cfm. Enter bathroom height step 4.

If your bathroom is larger than 100 square feet tally the cfm requirements for the individual fixtures to estimate your needs. Bathroom vent fans serve an important function by removing humid air from your home to prevent mold and mildew from forming. 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 example if your bathroom is 80 square feet you need a vent fan with an 80 cfm capacity. Bathroom extractor fans are mandatory in any bathroom without a window and still highly recommended in bathroom with windows. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific 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. The fan pulls air out of the bathroom and allows fresh air to be drawn in. The effectiveness of the fan will be rated in cfm or.