Testing, Adjusting, and Balancing (TAB) involves measuring and adjusting air and water flows to meet design requirements. The TAB process is comprised of using test instruments, sensors and monitors to verify appropriate temperatures, airflow and other characteristics within the ACMV system. Testing, Adjusting, and Balancing is a vital step for complex air systems within buildings and throughout campuses to ensure ACMV systems are optimized for occupant comfort, energy efficiency, indoor air quality, and manufacturing processes.

Most TAB work involves testing, measurement, and establishing performance benchmarks. Key examples of these activities include quantifying air volumetric flow rates and adjusting ventilation and air exchange rates.