![]() Now that you know how to compute for CFM, let’s see how different ACH requirements of rooms affect the CFM ratings of fans. Plugging in all of the information into the above CFM formula would look like this:ĬFM = 200 square feet x 10 feet x 4 ACH / 60 In application, let’s say you have a 200-square-foot room with a 10-foot ceiling and you need four ACH. Next, use the following formula to calculate CFM: To calculate CFM, you first need to gather the following information: room size (square feet of the room), the ceiling height (in feet), and the number of required ACH. Basements need much less, at 3-4 ACH, because the space is rarely occupied. ![]() The number of required ACH varies, depending on the type of room or space. ACH refers to the number of times the volume of air inside a room is removed or replaced every hour. The CFM rating you need varies depending on the size of the room, the number of preferred air changes per hour (ACH), and the activity or application. Fans with high CFM ratings are more effective in promoting airflow than those with low CFM ratings. The higher the CFM rating of a fan, the faster it can circulate air within a space. CFM is also applicable to non-cooling systems, like heaters, British Thermal Unit (BTU) ratings for stoves, kitchen range hoods, and air compressors. This is used to gauge the amount of air a fan or other similar types of equipment, such as HVAC systems, bathroom exhaust fans, ceiling fans, air purifiers, blowers, and more can move inside a room. ACH requirements for specific rooms and living spacesĬFM is the measurement of airflow or the volume of air in cubic units.
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