Cfm Fan For Bathroom Size

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 1800 7 5.

Cfm fan for bathroom size.

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. Length x width x height x 0 13 minimum cfm rating. Enter bathroom width ft. When installing a vent fan make sure there s at least a 1 2 gap under the bathroom door to allow fresh air to enter the room when the fan is running.

Enter bathroom height step 4. Ft in the room. Determine the size of your bathroom with this formula. Press calculate minimum suggested bath fan cfm.

Enter bathroom length ft. Sizing for large bathrooms for bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room. If your bathroom has an 8 ceiling the cfm rating for your fan should be as least as high as the number of square feet 5 x 7 35 sq. The result is the cfm or cubic feet per minute rating required for your bathroom fan.

Simply enter the dimensions of your bathroom in the calculator below to determine the minimum size vent fan you need for the bathroom in your home. Hi tam bathroom vent fans are rated by the cubic feet per minute cfm of air they move and should be sized to replace the air in the room at least eight times an hour. So in your case a 50 cfm fan should work. Divide the volume of your bathroom in feet by 7 5.

Most fans are rated from 50 to 110 cfm. Suggested cfm for the bathroom is based on cycling all the air in the bathroom 8 times per hour. To arrive at your required cfm simply divide your bathroom s volume by 7 5. The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one hour.

If all else fails check the packaging. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom. The minimum allowed fan size is 50 cfm so if your bathroom is for example only 42 square feet you still need a 50 cfm fan. For bathrooms 50 square feet and smaller it is recommended you purchase a bath fan designed for small rooms which will typically have a cfm range of 50 79.

It is based on hvi home ventilating institute guidelines that recommend approximately 8 room air exchanges per hour for a bathroom under 100 square feet of area.