Understanding Airflow Monitors, Test and Balance (TAB), Air Balance Monitors Airflow monitors, Test and Balance (TAB), and Air Balance are all related to the field of heating, ventilation, and air conditioning (HVAC) systems. Let’s break down each term: In summary, airflow monitors, Test and Balance (TAB), and air balance are all important aspects of HVAC system maintenance and optimization, ensuring that systems operate efficiently, reliably, and provide comfortable and healthy indoor environments.