In principle, airflow is proportional to rotational speed and static pressure is proportional to the square of the rotational speed. The shape of P-Q performance changes when fan speed is altered, and also when multiple fans are used. The airflow and static pressure values under the fan's operating conditions lie between these two points. This session will explain P-Q performance using a typical axial fan as an example.Īs the above P-Q performance curve shows, airflow is at its maximum when static pressure is 0 Pa, and static pressure is at its maximum when airflow is 0 m3/min. static pressure characteristics, also called P-Q performance curves, show the performance characteristics of fans, and vary with the fan type and model. The airflow and static pressure values under the fan's operating conditions are the points on the curve.Īirflow vs. In our catalogs, every fan model is provided with a curve titled "Airflow - Static Pressure Characteristics" separate from the specifications table. So, what are the airflow and static pressure under real operating conditions? It is impossible, however, to meet either of these conditions in real-world operation, so a fan's maximum airflow and maximum static pressure can never actually be obtained.Īirflow vs. The maximum static pressure is the static pressure when the fan's outlet is completely blocked. The maximum airflow is defined as the airflow when there are no obstructions on either the inlet or outlet sides of a fan. Higher static pressure means that the fan can even ventilate inside equipment with high mounting density. Definitions of Maximum Airflow and Maximum Static PressureĪirflow indicates the volume of air that a fan can move per unit of time, and static pressure is the ability of a fan to push air against resistance. In this fourth session, let's learn about fan airflow and static pressure. However, neither of the maximum airflow and maximum static pressure values can ever be obtained in real systems. When you evaluate the performance of fans, you probably look at the maximum airflow and maximum static pressure ratings in catalogs.
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