Cfm Meaning Bathroom Fan

The most common use for this formula is when installing a bathroom fan.

Cfm meaning 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. Larger bathrooms require additional ventilation capacity. You could have a fan that moves a lot of air with a high cfm but does so at a high wattage. Cfm is key when determining a fan s airflow efficiency.

If a bathroom is 8 x 8 with 8 ceiling that equals 512 cubic feet. The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one 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. The following chart can be used as a guide for proper bathroom.

Cubic volume 7 5 cfm necessary. This keeps the moisture from the shower bath or sink from encouraging mold growth. A cfm of 75 is the minimum number to make a fan efficient. The result is the cfm or cubic feet per minute rating required for your bathroom fan.

Choose a fan with a cfm rating appropriate for your room size to ensure adequate ventilation. Bathroom vent fans serve an important function by removing humid air from your home to prevent mold and mildew from forming. For example a 7 x 10 bathroom would require a 70 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.

The fan pulls air out of the bathroom and allows fresh air to be drawn in. Cfm is the acronym for cubic feet per minute the measure of air volume moved by the fan blower. For most bathrooms this works out to one cfm per square foot of bathroom area. The formula to calculate bathroom exhaust fan size reads as follows.

Airflow efficiency is the cfm divided by the watts amount of energy used to run the fan at its highest speed. 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. The effectiveness of the fan will be rated in cfm or. Why you need to have the proper size extractor fan.

In the case of a blower or fan it indicates how much air it can move per minute.