What Size Return Do I Need For A 4 Ton AC Unit? 1 ton of cooling is equal to 400 cubic feet of air per minute. 2 ton of cooling is 800 cfm and so on. So a 4 ton unit will have 1600 cubic feet of air passing through the system every minute. How
How Do You Calculate Cfm Of Air Flow? 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 CFM for HVAC? To calculate CFM, you need to know the size
How Do You Calculate Grill Cfm? CFM = FPM x Duct Cross Sectional Area. FPM = 4005 x √.45. FPM = 2,686. CFM = 2,686 x Duct Cross Sectional Area. A (Duct Cross Sectional Area) = X (height in feet) x Y (width in feet) A = 1.07 sq. feet. CFM = FPM x Duct