Commercial Restroom Exhaust Fan Sizing

This section discusses the minimum exhaust capacity of the exhaust fan.

Commercial restroom exhaust fan sizing.

A commercial restroom will require air to be changed 8 12 times an hour depending on the size of the facility and your local code. Why your bathroom should have an exhausting vent fan bathroom venting fans are about more than just eliminating noxious odors. This exhaust air can be routed either to the roof using ductwork and a roof vent or to the side. Greenheck is the leading supplier of air movement control and conditioning equipment including fans.

Here s how we get this number. Bathroom fan exhaust size calculator. Determining the best location for a fan depends on the airflow pattern desired and the physical characteristics of the building. For example a bathroom with a volume of 1000 cubic feet 28 3 cubic meters needs a fan capable of moving 1000 7 5 or 133 cfm 3 8 cubic meters per minute.

50 cubic feet per minute cfm intermittent or 20 cfm continuous. Number of exhaust grilles the design in f includes four exhaust grilles one over each ater closet and one over the bank of urinals. It may seem to make sense to exhaust above each xture. Sizing for large bathrooms for bathrooms over 100 square feet exhaust fans can be sized according to the number of fixtures in the room.

Cubic feet per minute cfm. By surveying the building structure and visualizing how the air should flow the place to locate the fan usually becomes evident. This fan calculator is typically used to calculate the cfm or cubic feet per minute of air exchange that may be desired in a building. Commercial and industrial ventilation can be expensive to install or update and finding the right type and size of fan will keep companies and industries in compliance with codes and regulations.

For a standard 10ft by 10 ft bathroom with an 8 ft ceiling you will need an exhaust fan capable of 106 67 cfm. In our example restroom the exhaust rate at 0 cfm 3 s per plumbing xture ould be 420 cfm 210 s figure 2 don from 0 cfm 280 s based on 10 ach f. Cubic volume 7 5 cfm necessary. 10ft 10ft 8ft 7 5 106 67 cfm.

Whether exhausting air or bringing fresh air into a structure the calculation produced should help to figure out the size of fan s required to accomplish the air exchanges needed. The formula to calculate bathroom exhaust fan size reads as follows. To arrive at your required cfm simply divide your bathroom s volume by 7 5. The minimum allowed fan size is 50 cfm so if your bathroom is for example only 42 square feet you still need a 50 cfm fan.