Cfm Meaning Bathroom Fan

A 50 cfm rating is recommended as a minimum for bathrooms 50 sq.

Cfm meaning bathroom fan.

Cubic volume 7 5 cfm necessary. The formula to calculate bathroom exhaust fan size reads as follows. Bathroom extractor fans are mandatory in any bathroom without a window and still highly recommended in bathroom with windows. The most common use for this formula is when installing a bathroom fan.

If a bathroom is 8 x 8 with 8 ceiling that equals 512 cubic feet. The exhaust fan removes moisture and humidity from your bathroom. 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 result is the cfm or cubic feet per minute rating required for your bathroom fan.

So for example a 1 000 cfm fan can remove all of the air from a box that is 10ft x 10ft x 10ft in one minute. A cfm of 75 is the minimum number to make a fan efficient. Airflow efficiency is the cfm divided by the watts amount of energy used to run the fan at its highest speed. Cfm is key when determining a fan s airflow efficiency.

This keeps the moisture from the shower bath or sink from encouraging mold growth. The effectiveness of the fan will be rated in cfm or. For most bathrooms this works out to one cfm per square foot of bathroom 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.

For example a 7 x 10 bathroom would require a 70 cfm fan. Cfm is the acronym for cubic feet per minute the measure of air volume moved by the fan blower. Bathroom vent fans serve an important function by removing humid air from your home to prevent mold and mildew from forming. The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one hour.

Larger bathrooms require additional ventilation capacity. In the case of a blower or fan it indicates how much air it can move per minute. The following chart can be used as a guide for proper bathroom. You could have a fan that moves a lot of air with a high cfm but does so at a high wattage.

Choose a fan with a cfm rating appropriate for your room size to ensure adequate ventilation.