Cfm For Bathroom Fan

Otherwise use the appropriate calculation based on the room size.

Cfm for bathroom fan. Determine the size of your bathroom with this formula. Length x width x height x 0 13 minimum cfm rating. 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.

The effectiveness of the fan will be rated in cfm or cubic feet per minute of air moved. A second fan may be needed. Just remember that the fan needs airflow to do its job.

The result is the cfm or cubic feet per minute rating required for your bathroom fan. To do this measure your room size to determine the correct cubic feet per minute cfm fan rating. 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.

For quick reference a 50 square foot bathroom needs a 50 cfm fan. To be effective a bathroom fan needs to be powerful enough to completely replace the air in the room about 8 times every hour. If the enclosed space is small a 50 cfm fan should suffice.

The bigger your bathroom the higher the cfm rating you ll need. If you have a bathroom with a separate enclosed toilet you ll also need an additional fan for that space. If all else fails check the packaging.

Another consideration to think about is the placement of your fan. Learning how to calculate cfm for a bathroom fan will help you purchase the right size fan for your space. The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one hour.