Cfm For Bath Fan

Enter bathroom width ft.

Cfm for bath fan.

Enter bathroom length ft. Suggested cfm for the bathroom is based on cycling all the air in the bathroom 8 times per hour. 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 that s too small won t remove moisture and odors efficiently and will need to run longer increasing wear on the motor.

Standard fan sizing applies to bathrooms that are 100 square feet or less. Standard fan sizing. Bathroom vent fans serve an important function by removing humid air from your home to prevent mold and mildew from forming. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom.

Enter bathroom height step 4. To arrive at your required cfm simply divide your bathroom s volume by 7 5. The rule of thumb is that you need at least 1 cfm per square foot of room area. The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one hour.

For bathrooms between 50 and 100 square feet estimate approximately 1 cfm per square foot. Determine the required cfm for your bathroom fan. An effective bathroom fan should be capable of replacing the entire volume of air 8 times per hour or every 7 5 minutes. For example a bathroom with a volume of 1000 cubic feet 28 3 cubic meters needs a fan capable.

In general for rooms with 8 foot ceilings. The result is the cfm or cubic feet per minute rating required for your bathroom fan. Bathroom vent fans are rated for the amount of air they can move measured in cubic feet per minute or cfm.