Why is measuring airflow in cubic feet per hour relevant?

Measuring airflow in cubic feet per hour (CFH) is essential because it quantifies the volume of air that a system delivers over a specified period. This measurement is critical for several reasons. It helps establish whether a heating, ventilation, and air conditioning (HVAC) system is providing adequate ventilation to maintain indoor air quality, comfort, and system efficiency.

By knowing the airflow in CFH, technicians can determine if the system is operating as designed and whether it meets the heating or cooling load requirements for a space. It also facilitates benchmarking against manufacturer specifications or building codes, which helps in diagnostics and optimization of system performance.

While the other options provide valuable insights into different aspects of HVAC performance, measuring airflow specifically addresses the critical factor of air volume distribution, which is foundational for effective climate control in any space.