HVAC TAB Fundamentals: Testing, Adjusting & Balancing Explained

What HVAC testing, adjusting and balancing (TAB) is, the NEBB/AABC/ASHRAE 111 standards that govern it, the process step by step, and how to choose a testing and balancing company.

What HVAC TAB Means: TAB stands for Testing, Adjusting, and Balancing: the discipline of measuring an HVAC system's actual performance, adjusting it to match the engineer's design, and documenting the result. Testing means taking calibrated readings of airflow, water flow, temperatures, and pressures

The Standards That Govern TAB Work: Credible TAB work follows published industry standards rather than a technician's habits. The two certifying bodies in North America are NEBB (National Environmental Balancing Bureau) and AABC (Associated Air Balance Council); both require firm certification, technician qualifica