If a duct measures 36 in. x 24 in. and has an average velocity of 600 fpm, what is the CFM?

If a duct measures 36 in. x 24 in. and has an average velocity of 600 fpm, what is the CFM?

• A. 3600 CFM
• B. 2400 CFM
• C. 1200 CFM
• D. 1000 CFM

Answer: (A)

To determine the CFM (Cubic Feet per Minute) of air moving through a duct, you can use the formula: CFM = Area (in square feet) × Velocity (in feet per minute). First, you need to calculate the cross-sectional area of the duct. The dimensions of the duct are 36 inches by 24 inches. To find the area in square feet, convert the dimensions from inches to feet: - 36 inches ÷ 12 inches per foot = 3 feet - 24 inches ÷ 12 inches per foot = 2 feet Now, multiply these two measurements to find the area: Area = 3 feet × 2 feet = 6 square feet. Next, use the average velocity provided (600 fpm) to find the CFM: CFM = 6 square feet × 600 fpm = 3600 CFM. Thus, the calculated CFM of 3600 is confirmed by applying the calculations correctly to the given dimensions and velocity, making this the correct answer.

To determine the CFM (Cubic Feet per Minute) of air moving through a duct, you can use the formula:

CFM = Area (in square feet) × Velocity (in feet per minute).

First, you need to calculate the cross-sectional area of the duct. The dimensions of the duct are 36 inches by 24 inches. To find the area in square feet, convert the dimensions from inches to feet:

• 36 inches ÷ 12 inches per foot = 3 feet

• 24 inches ÷ 12 inches per foot = 2 feet

Now, multiply these two measurements to find the area:

Area = 3 feet × 2 feet = 6 square feet.

Next, use the average velocity provided (600 fpm) to find the CFM:

CFM = 6 square feet × 600 fpm = 3600 CFM.

Thus, the calculated CFM of 3600 is confirmed by applying the calculations correctly to the given dimensions and velocity, making this the correct answer.