CFM is a measure of what in building performance?

CFM, which stands for Cubic Feet Per Minute, is a standard measure of airflow or ventilation rates within a building. It quantifies the volume of air that passes through a specific point, such as ducts, vents, or fans, in one minute. This measurement is crucial for assessing the effectiveness of HVAC systems, ensuring adequate air circulation for comfort and indoor air quality.

Monitoring CFM helps professionals identify whether a building's ventilation systems are operating efficiently, if they are providing enough fresh air, and if there are any blockages or issues affecting airflow. Understanding airflow rates is essential for creating a healthy, comfortable indoor environment and for optimizing energy efficiency.

Other options do not accurately represent CFM. While they may refer to specific concepts in building performance or flow measurement, they do not align with the widely recognized standard definition of airflow, making the choice of Cubic Feet Per Minute the correct answer in the context of building performance.