What does CFMn stand for?

CFMn stands for "Cubic Feet Per Minute natural." This term is commonly used in the context of HVAC and building performance analysis to measure airflow. Specifically, it denotes the volumetric flow rate of air in cubic feet that passes through a particular point in a system per minute, normalized to standard conditions.

In this context, "natural" indicates that the measurement is taken under normal atmospheric conditions, ensuring consistent comparisons across different measurements and systems. Understanding CFMn is crucial for assessing ventilation performance, energy efficiency, and comfort levels in buildings, as it provides a standard way to evaluate how much air is being moved within a space.

Other options, while they may sound plausible, do not accurately capture the conventional terminology and its application in the field of building management and energy analysis.