Cubic Feet Per Minute (CFM) is a measurement for finding the air volume velocity and it is commonly used for measuring the air flow in heating or cooling diffuses. CFM is also used as a rating and it depends on your room size to ensure adequate ventilation.
Feet per Minute = 20 fpm, Area in square feet = 55 ft2.
Cubic Feet Per Minute
Substitute the value of FPM=20 and Area=55 ft2 in the formula, CFM= (fpm * area) = 20 * 55 = 1100.
Simple tutorial on Cubic Feet Per Minute with definition, formula and example to learn online.