Cfm Rating Bathroom Exhaust Fan

The result is the cfm or cubic feet per minute rating required for your bathroom fan.

Cfm rating bathroom exhaust fan.

If the enclosed space is small a 50 cfm fan should suffice. 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. The formula to calculate bathroom exhaust fan size reads as follows.

A second fan may be needed. Panasonic offers their well known whisperceiling fan in various cfm ratings 50 cfm 80cfm 110cfm 150 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. Length x width x height x 0 13 minimum.

The exhaust fan removes moisture and humidity from your bathroom. Therefore a bathroom with an area of 70 square feet needs a fan with a minimum cfm rating of 70. Fan ratings typically run between 50 and 110 cfm. The duct fan is rated 120 cfm free air.

Why you need to have the proper size extractor fan. A fan s ability to move air is measured in cubic feet per minute cfm. Determine the size of your bathroom with this formula. Another bathroom exhaust fan of the type purchased by commercial establishments pulls 470 cfm at the cost of 8 0 sones.

A bathroom that is 50 square feet or less needs a 50 cfm fan. 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. Purchase a bathroom fan with the required cfm rating or higher. Just remember that the fan needs airflow to do its job.

The bigger your bathroom the higher the cfm rating you ll need. 1 panasonic fv 11vq5 whisperceiling bathroom exhaust fan review. A bathroom exhaust fan that is rated 50 cfm is ok to use in bathrooms that are 50 square feet or smaller. With larger rooms at least one cfm for each square foot is required.

After calculating your required cfm make sure to check the rating of any fan your purchase. 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.

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. I installed a 5 duct fan for bathroom exhaust the total length of duct to outside is less than 6 ft. The appropriate size fan for a bathroom can replace the room s air.