Question

how to calculate CFM and air changes​

Answer 1

In plain English, we're changing CFM into Cubic Feet per Hour (CFH). Then wecalculate 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.
to Calculate the CFM of a Room

1.Measure the room's width and length. ...

2.Multiply the three measurements from step 1 to determine the cubic footage of the room. ...

3.Multiply the cubic volume of the room by the number of times you want the air to turn over or exchange in an hour. ...

4.Divide your answer from step 3 by 60 to calculate CFM.

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