The quantity of air moving through a fan system is typically expressed in what unit?

The quantity of air moving through a fan system is most commonly expressed in cubic feet per minute (CFM). This unit measures the volume of air that flows through a fan or duct system in one minute, which is essential for understanding airflow in HVAC applications.

CFM provides a clear indication of how much air is being circulated, which is critical for maintaining comfort, ensuring proper ventilation, and assessing the efficiency of air systems in buildings. Knowing the airflow in CFM allows HVAC professionals to design systems that meet the specific ventilation and cooling or heating needs of a space effectively.

While other units like feet per minute refer to the speed of airflow and cubic meters can also describe volume, they do not provide the direct measurement of how much air is being moved over time, which is why cubic feet per minute is the standard unit used in this context.