What is the total airflow in CFM if the air velocity is 500 fpm and the duct area is 1.38 square feet?

To find the total airflow in cubic feet per minute (CFM), you can use the formula:

[ \text{CFM} = \text{Velocity (fpm)} \times \text{Area (sq ft)} ]

In this case, the air velocity is 500 feet per minute (fpm), and the duct area is 1.38 square feet. Using the formula:

[ \text{CFM} = 500 , \text{fpm} \times 1.38 , \text{sq ft} ]

Calculating this gives:

[ \text{CFM} = 500 \times 1.38 = 690 ]

Thus, the total airflow is 690 CFM. This calculation shows how air velocity and duct area work together to determine the total flow of air.

Understanding the relationship between air velocity and duct area is essential in HVAC design, as it helps determine the efficiency of air distribution in a system. In this scenario, using the provided values in the formula correctly leads to the identification of the airflow rate, reinforcing the importance of accurate measurements in HVAC applications.