Bathroom Exhaust Fan Cfm

The formula to calculate bathroom exhaust fan size reads as follows.

Bathroom exhaust fan cfm. To give you an idea of sizing this works out to one cfm per square foot of bathroom area and round up to the nearest 10. I installed a 5 duct fan for bathroom exhaust the total length of duct to outside is less than 6 ft. This decorative exhaust fan looks more like a conventional flush mounted light fixture but inside is a motor capable of moving 110 cfm. For an incognito bathroom exhaust fan consider the hunter sona bath fan with light.

Here s how we get this number. Required cubic feet per minute cfm the fan air movement is measured in cubic feet per minute cfm. The fan and light operate separately or together and are housed in a classic white design that complements any decor. The duct fan is rated 120 cfm free air.

The fan won t even push the damper open even with the spring on the exhaust damper removed. Can i add another fan in line to improve air flow or will one fan work against the other. 10ft 10ft 8ft 7 5 106 67 cfm. For a standard 10ft by 10 ft bathroom with an 8 ft ceiling you will need an exhaust fan capable of 106 67 cfm.

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. For example a bathroom with floor dimensions of 8 x 9 72 sq. For instance if a bathroom is 10 feet long 8 feet wide and 9 feet tall the volume of the room is 720 cubic feet. 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.

The effectiveness of the fan will be rated in cfm or cubic feet per minute of air moved. The result is the cfm or cubic feet per minute rating required for your bathroom fan. The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one hour. Learning how to calculate cfm for a bathroom fan will help you purchase the right size fan for your space.

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. So the recommended fan size would be 80 cfm. The nutone white 50 cfm exhaust bath fan the nutone white 50 cfm exhaust bath fan with light combines efficient air circulation and up to 100 watts of illumination in one easy installation. The final answer is the minimum cfm rating for the fan.

Broan nutone ae80b invent series single speed fan ceiling room side installation bathroom exhaust fan energy star certified 1 5 sones 80 cfm 4 6 out of 5 stars 302 55 97 55. Bathroom fan exhaust size calculator.