Static Pressure Fans Vs High Air Flow

Static pressure is used to evaluate the amount of impact various ventilation system components have on the airflow path within a given system.

Static pressure fans vs high air flow.

Fan total pressure is the pressure differential between the inlet and the outlet of the fan. Static pressure fans come with wider blades but the gaps between the main difference has a direct connection with how the fans are optimized because the cooling system works differently. The 3 points depict possible scenarios where the fan will perform. And when static pressure increases air flow decreases.

High airflow fans simply push as much air as possible while static pressure fans are specifically designed to tackle installations with heightened impedance and resistance. Static pressure optimized fans made to push the air harder through small spaces. It can be expressed in these terms. Most manufacturers performance charts are based on fan static pressure.

Static pressure fans feature large blades fewer flat blades and small gap between the body and the fan blade which holds them together. The relationship between air flow and static pressure of a fan is shown in the graph above. A fan performance spec is given as a fan total pressure or a fan static pressure which can handle a certain flow rate. So there are two situations where you might think of choosing between a static pressure fan and an air.

Specifically i will be using corsair s sp120 and af120 models as these are very popular fans and have clearly defined characteristics sp for static pressure af for airflow. All other components create. For mechanical ventilation systems the fans create positive static pressure to move air through a given system. When air flow increases static pressure decreases.