Cfm Rating Bathroom Exhaust Fan

Panasonic offers their well known whisperceiling fan in various cfm ratings 50 cfm 80cfm 110cfm 150 cfm.

Cfm rating bathroom exhaust fan.

The exhaust fan removes moisture and humidity from your bathroom. Another bathroom exhaust fan of the type purchased by commercial establishments pulls 470 cfm at the cost of 8 0 sones. The formula to calculate bathroom exhaust fan size reads as follows. 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.

Fan ratings typically run between 50 and 110 cfm. The result is the cfm or cubic feet per minute rating required for your bathroom fan. A fan should have a cfm rating high enough to replace the air in your bathroom at a rate 8 times per hour. If the enclosed space is small a 50 cfm fan should suffice.

Purchase a bathroom fan with the required cfm rating or higher. Determine the size of your bathroom with this formula. Therefore a bathroom with an area of 70 square feet needs a fan with a minimum cfm rating of 70. Just remember that the fan needs airflow to do its job.

The duct fan is rated 120 cfm free air. The bigger your bathroom the higher the cfm rating you ll need. A fan s ability to move air is measured in cubic feet per minute cfm. The cfm number should be equal to or higher than the listed square footage of the bathroom an exhaust fan is being installed in i e.

A second fan may be needed. 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. I installed a 5 duct fan for bathroom exhaust the total length of duct to outside is less than 6 ft. 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.

Length x width x height x 0 13 minimum. After calculating your required cfm make sure to check the rating of any fan your purchase. With larger rooms at least one cfm for each square foot is required. Otherwise use the appropriate calculation based on the room size.

Cubic volume 7 5 cfm necessary. The fan won t even push the damper open even with the spring on the exhaust damper removed. A bathroom exhaust fan that is rated 50 cfm is ok to use in bathrooms that are 50 square feet or smaller. A bathroom that is 50 square feet or less needs a 50 cfm fan.

The appropriate size fan for a bathroom can replace the room s air. Bathroom extractor fans are mandatory in any bathroom without a window and still highly recommended in bathroom with windows. Why you need to have the proper size extractor fan.