Air flow tests are tests for measuring the movement of air passing through a component or product, or for measuring the performance characteristics of an air-moving device such as a fan.

The passage of air through a complex electronic product or through a simple duct is more limited compared to air flow in the free space. The resistance that air flow encounters in this way is called air flow impedance.

In the laboratory, this impedance value is determined using a calibrated airflow test chamber and by measuring the pressure difference between the inlet and outlet of the product. Impedance increases as the amount of air increases. Airflow performance is also measured in the laboratory environment.

For example, when a fan is operated in a free space, the airflow performance is high. The higher the air flow impedance, the lower the air flow amount. In general, the point where the product impedance curve intersects the fan performance curve is the ideal airflow operating point.

Air flow test results guide manufacturers to minimize product size and noise and optimize product cooling.

On the other hand, the determination of air flow rate, air flow rate and number of changes is an important issue for clean rooms. TS EN ISO 14644-3 Clean rooms and associated environments - Part 3: The test methods standard regulates these test criteria. Measurements and calculations are carried out with special devices to control the quality and quantity of air supplied to the clean room class.

The methods and standards published by the domestic and foreign organizations are complied with in the air flow tests performed by the authorized institutions. For example, the EN 13779 standard is one of them (Ventilation - Non-residential - Performance specification standard for ventilation and room air conditioning systems.)