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Evaluation

HVAC Strategies

Breakout 1

Airflow Measurement Extravaganza

Presentation

Tuesday, April 14, 2026
8:30 AM - 10:00 AM  
Location: A223- 225 (Level 2)
CE: 1.5
CEU Type(s): BPI, BSI, INTERNACHI, NARI, NATE, RESNET
Airflow measurements may sound simple, but they are among the most difficult HVAC performance tests to perform accurately. While pressure is relatively easy to measure, converting it into reliable airflow values is far more complex.
This session explores the wide range of tools and techniques used to measure airflow—some standard and approved, others less conventional. Participants will learn how to evaluate heating and cooling systems, exhaust fans, and low-flow ventilation systems using both passive and active measurement methods.
Devices and Methods Demonstrated or Explained:
Vane anemometers
Hot-wire traverse
FlowBox / Exhaust Fan Flow Meter (“box with a known opening”)
Flow hoods (passive and powered)
TrueFlow Grid
Pressure matching with duct tester or blower door
Temperature-split calculation
Total External Static Pressure with fan tables

Learning Objectives:

By attending this session, attendees will:
  • List 3 different methods to measure airflow
  • Explain why airflow is difficult to measure accurately and describe the differences between passive and active measurement approaches
  • How to be confident if the measurements are accurate, close or unrealistic