Cfm Rating For 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.

Cfm rating for bathroom fan.

A second fan may be needed. Just remember that the fan needs airflow to do its job. If your bathroom has a toilet or shower area enclosed by a door it s a good idea to install a separate exhaust fan for that area. Determine the size of your bathroom with this formula.

After calculating your required cfm make sure to check the rating of any fan your purchase. A fan should have a cfm rating high enough to replace the air in your bathroom at a rate 8 times per hour. In this case a fan with a cfm rating of 80 would probably be sufficient for 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 higher the sone rating a bathroom fan has the noisier that model is when it s running i e. Units on the market are designed to move air at a variety of rates. The result is the cfm or cubic feet per minute rating required for your bathroom fan. Look for the cfm rating on any fan you re considering to see how much air the fan moves per minute.

Length x width x height x 0 13 minimum. Another bathroom exhaust fan of the type purchased by commercial establishments pulls 470 cfm at the cost of 8 0 sones. The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one hour. The purpose of a bathroom fan is to move air up and out thereby keeping the moisture in your home balanced and your bathroom clean and mold free.

A fan s ability to move air is measured in cubic feet per minute cfm. A bathroom exhaust fan that s rated 0 7 sones runs much quieter than a bathroom fan that is rated 4 0 sones. If the enclosed space is small a 50 cfm fan should suffice. Here are a few tips.

Its cfm per sone rating is 0 0800 about 20 times less efficient on a cfm per sone basis than the whisperquiet and higher than most other bathroom fans on the market. The fan is ic rated. Bathroom vent fans serve an important function by removing humid air from your home to prevent mold and mildew from forming. Otherwise use the appropriate calculation based on the room size.

The bigger your bathroom the higher the cfm rating you ll need. Included gfci wiring harness. Noise the noise emitted by an exhaust fan is rated in sones and most fans have a sones rating. Purchase a bathroom fan with the required cfm rating or higher.

With a sones rating of 1 0 it is also on the quiet end of the spectrum.