What is the formula to determine CFM when given area and velocity?

The formula to determine CFM, or Cubic Feet per Minute, when given area and velocity is correctly expressed as CFM = Area x Velocity.

This equation is based on the relationship between flow rate, cross-sectional area, and the velocity of the air moving through that area. Specifically, CFM represents the volumetric flow rate of air, which is the volume of air that passes through a given area in a certain amount of time.

When you multiply the cross-sectional area (measured in square feet) of the duct or opening by the velocity (measured in feet per minute) of air flowing through that area, you obtain the total volume of air that flows in one minute (expressed in cubic feet).

For instance, if you have an area of 2 square feet with an air velocity of 500 feet per minute, the flow rate would be 2 x 500 = 1000 CFM. This illustrates how the area and velocity components directly influence the calculation of air movement in HVAC systems.

In contrast to the other choices, adding the area and velocity does not yield a meaningful physical measurement in this context. Dividing area by velocity or velocity by area also does not relate to how you calculate airflow; these relationships