This is the first that I’m reading about “airflow certifications/requirements”. A brief search led me to this article explaining the concept of HVAC balancing.

This is the first that I’m reading about “airflow certifications/requirements”. A brief search led me to this article explaining the concept of HVAC balancing. [0] [0] https://www.primexvents.com/certification-matters-balancing-hvac/ https://www.primexvents.com/certification-matters-balancing-...