Impedance Relationship – Thermal Design

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Obstructions in the airflow path cause static pressure within the enclosure.
To achieve maximum airflow, obstructions should be minimized. However,
obstructions in the form of baffles may be necessary to direct the airflow
over the components that need cooling.


Impedance Relationship Curve for an Electronics Enclosure
Typical Relationship between Airflow and Static pressure for an Axial Cooling
The left figure 
shows the nonlinear relationship between airflow and
static pressure for a typical fan.