True or False? On duct measuring 40" x 22", with air velocity of 1,500 FPM, the CFM is 9167.

To determine the correct CFM (Cubic Feet per Minute) for a duct measuring 40 inches by 22 inches with an air velocity of 1,500 FPM (Feet Per Minute), it is essential to understand the formula for calculating CFM:

CFM = (duct cross-sectional area in square feet) x (air velocity in FPM).

First, we need to convert the duct dimensions from inches to feet. A duct that is 40 inches wide and 22 inches tall converts to:

• Width: 40 inches ÷ 12 = 3.33 feet

• Height: 22 inches ÷ 12 = 1.83 feet

Next, we calculate the cross-sectional area of the duct in square feet:

Area = Width x Height = 3.33 feet x 1.83 feet = 6.1 square feet (approximately).

Now we can use the velocity to find the CFM:

CFM = 6.1 square feet x 1,500 FPM = 9,150 CFM.

The answer provided (9,167 CFM) is slightly different from this calculation but may result from rounding or an approximation in the area or velocity used. Nevertheless, the closest interpretation