How To Calculate Cfm For Bathroom Fan

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.

How to calculate cfm for bathroom fan. The final answer is the minimum cfm rating for the fan. 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.

To calculate the minimum cubic feet per minute rating needed for an exhaust fan multiply the bathroom s length width and height and then multiply that result by 0 13. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom. First you have to measure your bathroom dimensions to calculate room volume length x width x height of the room feet.

The effectiveness of the fan will be rated in cfm or cubic feet per minute of air moved. The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one hour. Enter bathroom length ft.

A second fan may be needed. To be effective a bathroom fan needs to be powerful enough to completely replace the air in the room about 8 times every hour. This fan calculator is typically used to calculate the cfm or cubic feet per minute of air exchange that may be desired in a building.

Bathroom vent fans serve an important function by removing humid air from your home to prevent mold and mildew from forming. The result is the cfm or cubic feet per minute rating required for your bathroom fan. Cfm cubic feet per minute general term used to specify the amount of air that the bathroom fan is able to move within one minute of its operation.

Cubic volume 7 5 cfm necessary. The formula to calculate bathroom exhaust fan size reads as follows. Press calculate minimum suggested bath fan cfm.