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Here's the formula:
In plain English, we're changing CFM into Cubic Feet per Hour (CFH). Then we calculate the volume of the room by multiplying the room height times the width times the length. Then we simply divide the CFH by the volume of the room.
Here's how a full formula works:
Now, compare the air changes in the room to the required air changes for the type of room it is on the Air Changes per Hour Download accompanying this article. If it's a lunch or break room that requires seven to eight air changes per hour, you're right on target. If it's a bar that needs 15-20 air changes per hour, it's time to reconsider.
Let's look at this engineering formula differently. When airflow is unknown and you need to calculate the required CFM for a room, first you look at the Air Changes per Hour Chart and identify the required air changes needed for the use of the room. Let's say it's a conference room requiring 10 air changes per hour. Next calculate the volume of the room (L x W x H). Then divide by the required air changes per hour to get required CFM.
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