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ANSI/ASHRAE 41.2-2022
Standard Methods for Air Velocity and Airflow Measurements
Prescribes methods for air velocity and airflow measurement, including consideration of density effects. Applies to air velocity and airflow measurement for testing heating, ventilating, air conditioning, and refrigerating systems and components at pressures within this range: -25 kPa to +25 kPa (-100 in. of water to +100 in. of water) referenced to atmospheric pressure. Dual units of measurement.
American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. [ashrae]