CFM = (fpm * area), where fpm is the feet per minute. To find the cubic feet per minute, substitute the FPM value with the area after the area is squared.

How do you calculate air flow CFM?

By multiplying air velocity by the cross section area of a duct, you can determine the air volume flowing past a point in the duct per unit of time. Volume flow is usually measured in cubic feet per minute (CFM).

How many CFM do I need for a 12x12 room?

One cfm per square foot (1 cfm / square foot) of floor area is required. This is the average amount of air needed for a room or an entire building.