Which airflow measurement is typically used for duct systems?

Cubic feet per minute (CFM) is the standard measurement for airflow in duct systems because it quantifies the volume of air moving through a duct over a specific period. This measurement is crucial in HVAC applications because it helps determine the capacity of the system to ventilate, heat, or cool a space effectively.

Using CFM allows HVAC professionals to assess how well the ductwork is designed and whether it can meet the airflow needs of a particular building or space. It also plays an important role in ensuring comfort and efficiency, as well as in complying with building codes and standards.

Other measurements like Pascals (Pa) primarily relate to pressure rather than airflow, degrees Fahrenheit (°F) pertain to temperature, and liters per second (L/s) is more commonly used in some international contexts but is less prevalent in standard HVAC design and calculations. Therefore, CFM is the most relevant and widely accepted unit of measurement for evaluating airflow in duct systems.