Cfm For Bath Fan

To arrive at your required cfm simply divide your bathroom s volume by 7 5.

Cfm for bath fan.

The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one hour. A 50 square foot or smaller bathroom needs a 50 cfm fan. Bathroom vent fans serve an important function by removing humid air from your home to prevent mold and mildew from forming. 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 rule of thumb is that you need at least 1 cfm per square foot of room area. 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 height step 4. Enter bathroom width ft.

In general for rooms with 8 foot ceilings. For bathrooms between 50 and 100 square feet estimate approximately 1 cfm per square foot. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom. An effective bathroom fan should be capable of replacing the entire volume of air 8 times per hour or every 7 5 minutes.

Standard fan sizing. Determine the required cfm for your bathroom fan. Standard fan sizing applies to bathrooms that are 100 square feet or less. Enter bathroom length ft.

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. For example a bathroom with a volume of 1000 cubic feet 28 3 cubic meters needs a fan capable. The result is the cfm or cubic feet per minute rating required for your bathroom fan.