TAB is an abbreviation used to denote which process in building systems commissioning?

• A. Test and Balance
• B. Tabulation and Budget
• C. Technical Assessment Boundary
• D. Time Allocation Basic

Answer: (A)

TAB stands for Test and Balance. In building systems commissioning, this is the process of verifying that the HVAC system delivers the design airflow and pressure relationships across all zones. Technicians measure actual airflows at supply and return points, pressure drops, and temperature across rooms and spaces. They adjust dampers, variable air volume boxes, and pumps so the system meets the specified design criteria. The results are documented in a TAB report, which confirms the system operates as intended and helps ensure occupant comfort and energy efficiency. The other options don’t reflect a recognized commissioning process: they aren’t standard terms used to describe how HVAC systems are tested and balanced.