Cfm Rating For Bathroom Fan

Noise the noise emitted by an exhaust fan is rated in sones and most fans have a sones rating.

Cfm rating for bathroom fan.

Units on the market are designed to move air at a variety of rates. Purchase a bathroom fan with the required cfm rating or higher. A fan s ability to move air is measured in cubic feet per minute cfm. The higher the sone rating a bathroom fan has the noisier that model is when it s running i e.

The bigger your bathroom the higher the cfm rating you ll need. 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. Another bathroom exhaust fan of the type purchased by commercial establishments pulls 470 cfm at the cost of 8 0 sones. Determine the size of your bathroom with this formula.

Bathroom vent fans serve an important function by removing humid air from your home to prevent mold and mildew from forming. Look for the cfm rating on any fan you re considering to see how much air the fan moves per minute. 5 x research source a fan with too low of a rating won t remove moisture effectively while buying a fan with too much power may lead to unnecessary noise as more powerful fans tend to. A second fan may be needed.

The noise level of a bathroom fan will be indicated by the manufacturer in what is known as sones. At 110 cfm the fan is at the upper end of power compared to most other bathroom fans. Included gfci wiring harness. 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.

Length x width x height x 0 13 minimum. With a sones rating of 1 0 it is also on the quiet end of the spectrum. If the enclosed space is small a 50 cfm fan should suffice. The result is the cfm or cubic feet per minute rating required for your bathroom fan.

A bathroom exhaust fan that s rated 0 7 sones runs much quieter than a bathroom fan that is rated 4 0 sones. Here are a few tips. 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. The cfm represents the airflow required to completely exchange the air in your bathroom 8 times in one hour.

A fan should have a cfm rating high enough to replace the air in your bathroom at a rate 8 times per hour. The fan is ic rated. Otherwise use the appropriate calculation based on the room size. In this case a fan with a cfm rating of 80 would probably be sufficient for your bathroom.

Just remember that the fan needs airflow to do its job.