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See STEP 2 on page 4. Static Pressure is the resistance to airflow (friction) caused by the air moving through a pipe, duct, hose, material. There is a variation of axial flow duct fan that uses a blower wheel instead of a propeller. It is. referred to as a Tubular Centrifugal. We do not make any tubular centrifugal fans at Cincinnati Fan.
In many instances fan and pump applications are run at constant speed and the material flow is controlled by dampers or control valves which simply absorb energy and are wasteful as shown below. A good analogy is keeping your foot on the accelerator and using braking to control the speed of your car. A much better way is to use a VFD to dispense with the damper and control valve (leave them fully open) and to control the speed of the pump and hence material flow (air, water etc) as shown below.