Testing, Adjusting and Balancing (TAB)

Precision air-side and hydronic testing, proportional balancing, and performance verification to ensure HVAC installations deliver specified airflow, temperature differentials, and fluid flow rates.

Technician measuring airflow at a ceiling diffuser

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Specialized Line #01

Testing, Adjusting and Balancing (TAB)

Core Discipline

Scope & Standards

Technical Scope of Work

Precision air-side and hydronic testing, proportional balancing, and performance verification to ensure HVAC installations deliver specified airflow, temperature differentials, and fluid flow rates.

check_circleTerminal airflow verification: CFM / Lps at supply diffusers, return grilles, and exhaust registers

check_circleFan performance profiling: External static pressure (ESP), operating RPM, and motor running amperage

check_circleHydronic system balancing: Differential pressure (Delta-P) and flow rates (GPM) across balancing valves (DRVs)

check_circleRoom cascade pressurization testing for cleanrooms, isolation wards, laboratories, and corridors

check_circleThermal delta-T verification across chilled water cooling coils, AHUs, and condenser circuits

check_circleCertified TAB report submittal including raw field data sheets and instrument calibration logs

Standard TAB Methodology

Submittal & Drawing Review

Audit approved mechanical schedules, duct schematics, and test point accessibility.

Baseline Performance Diagnostics

Measure and record initial total system airflow, fan static pressures, and pump head.

Proportional Adjustment

Balance branch dampers, fan sheaves, VAV boxes, and hydronic balancing valves to design tolerances.

Consultant Witness & Sign-Off

Conduct joint witness testing with the supervising consultant and issue stamped documentation.

Typical Equipment Handled

Air Distribution Units

Air Handling Units (AHUs), Fan Coil Units (FCUs), Packaged Rooftop Units, and VAV terminal units.

Hydronic Systems

Primary and secondary chilled water loops, circuit balancing valves, and heat exchangers.

Ventilation Equipment

Exhaust fans, smoke management fans, stairwell pressurization systems, and fresh air louvers.

Specialized Spaces

Electrical substation switchgear halls, battery rooms, data centers, and laboratory spaces.

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Standards & Acceptance Criteria

Testing and balancing tolerances follow approved project specifications and recognized industry standards (including SMACNA HVAC Systems TAB and ASHRAE Standard 111). All readings are recorded using laboratory-calibrated test instruments.

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