Cfm For Bath Fan

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

Cfm for bath fan.

For example a bathroom with a volume of 1000 cubic feet 28 3 cubic meters needs a fan capable. Bathroom vent fans serve an important function by removing humid air from your home to prevent mold and mildew from forming. The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one hour. Determine the required cfm for your bathroom fan.

The result is the cfm or cubic feet per minute rating required for your bathroom fan. Standard fan sizing applies to bathrooms that are 100 square feet or less. Enter bathroom width ft. Enter bathroom length ft.

To arrive at your required cfm simply divide your bathroom s volume by 7 5. 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. Standard fan sizing. A 50 square foot or smaller bathroom needs a 50 cfm fan.

Press calculate minimum suggested bath fan cfm. Suggested cfm for the bathroom is based on cycling all the air in the bathroom 8 times per hour. In general for rooms with 8 foot ceilings. Enter bathroom height step 4.

The rule of thumb is that you need at least 1 cfm per square foot of room area. A fan that s too small won t remove moisture and odors efficiently and will need to run longer increasing wear on the motor. An effective bathroom fan should be capable of replacing the entire volume of air 8 times per hour or every 7 5 minutes.