Testing, Adjusting, and Balancing (TAB)


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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 HVAC system. Testing, Adjusting, and Balancing is a vital step for complex air and hydronic systems within buildings and throughout campuses to ensure HVAC 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 & hydronic volumetric flow rates, verifying heat transfer performance, and adjusting ventilation and air exchange rates.

Testing, Adjusting, and Balancing (TAB) throughout the Pacific Northwest

NorthWest Engineering Service, Inc., with offices in Beaverton, Eugene, and Boise, ID upholds the highest standards in the Testing, Adjusting, and Balancing of complex air and water systems. We’ve helped building owners, engineers, and design professionals achieve the correct balance of flow distribution since 1958. Not only are we a founding member of the first independent TAB apprenticeship in the nation , but we are one of the few companies that is certified by both the National Environmental Balancing Bureau (NEBB) and Associated Air Balance Council (AABC). We provide technically proficient and cost-effective services based on their procedural standards.

Our TAB services optimize environmental performance and occupant comfort and help keep your building’s operating costs down. With over six decades of experience, our team understands the most complex HVAC building systems, and uses the latest techniques and equipment to balance the total system effectively and efficiently.

Our HVAC TAB services include:

  • HVAC system surveys
  • Indoor air quality testing
  • Exhaust system troubleshooting
  • HVAC sound and vibration testing
  • Temperature control system verification
  • Air and hydronic system balancing and troubleshooting
  • Pressure and duct system leak testing and investigations

Meet some of our TAB Leaders below! 

“NWESI has demonstrated a consistent ability to understand the critical nature of our environments, perform their work with accuracy and respond quickly in urgent situations. Schaffran Construction is privileged to have NWESI as a partner and I would highly recommend them to anybody looking for a professional and responsive TAB and Commissioning contractor.”

Erik SchaffranPresident, Schaffran Construction, Inc.