CFM and velocity are usually measured in what units?

The correct answer is that CFM (Cubic Feet per Minute) and velocity in air handling systems are typically measured in feet per minute (FPM). This unit is widely used in HVAC (Heating, Ventilation, and Air Conditioning) applications to express the speed at which air moves through ducts and other components. It provides a clear understanding of airflow characteristics and helps in designing systems for optimal performance.

Feet per minute is preferable for gauging the velocity because it aligns with how airflow dynamics are analyzed in practical applications. This measurement captures the efficiency and effectiveness of the system in transporting air within a given area.

Other options, such as inches per hour, yards per second, and cubic feet per hour, do not accurately represent the standard units typically used in these contexts. Inches per hour is less commonly used for measuring speed in airflow scenarios, while yards per second is a much larger measurement scale inappropriate for the typical velocities encountered in HVAC systems. Cubic feet per hour, while related to airflow volume, does not directly measure the speed of the airflow, making it unsuitable for discussing velocity.