Bathroom Cfm Calculator

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

Bathroom cfm calculator. Here s how we get this number. This depends on the specific application and the stuffiness moisture or gases in the air. For a standard 10ft by 10 ft bathroom with an 8 ft ceiling you will need an exhaust fan capable of 106 67 cfm. Determining the cfm of a room is a mathematical process of figuring the room s cubic area as well as the rate at which you desire the air to circulate throughout the room.

Press calculate minimum suggested bath fan cfm. Learning how to calculate cfm for a bathroom fan will help you purchase the right size fan for your space. To be effective a bathroom fan needs to be powerful enough to completely replace the air in the room about 8 times every hour. 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.

It is based on hvi home ventilating institute guidelines that recommend approximately 8 room air exchanges per hour for a bathroom under 100 square feet of area. The term cfm is an acronym that stands for cubic feet per minute a term used to describe a fan s efficiency in terms of airflow. That s why we developed this handy bathroom vent fan cfm calculator. Suggested cfm for the bathroom is based on cycling all the air in the bathroom 8 times per hour.

10ft 10ft 8ft 7 5 106 67 cfm. The effectiveness of the fan will be rated in cfm or cubic feet per minute of air moved. The bath fan calculator is standard guide to help you find the minimum fan rating for your specific bathroom. Otherwise use the appropriate calculation based on the room size.

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. If the enclosed space is small a 50 cfm fan should suffice. Enter bathroom width ft.

In order to calculate the necessary cfm value you should divide bathroom s volume by 7 5. Enter bathroom height step 4. Refer to the calculator below for more guidance. Cubic volume 7 5 cfm necessary.

For example for a bathroom with 900 cubic feet volume it is required to purchase a bathroom fan of 120 cfm capacity. For example a 1000 square foot area may need a cfm exhaust fan of 1000 0 1 100 or 1000 1 1000. 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. Enter bathroom length ft.

Use our handy online calculator to see what size vent fan you need for your home. 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. Bathroom fan exhaust size calculator. Bathroom vent cfm calculator uses 3 stage formula located below.