from MEEB 9th ed.
Panel:
Most simple
For high efficiency air delivery, motor is generally mounted in the center of the propellers.
Likely the most noisy.
Not designed for much static pressure from ductwork, filters, etc.
Fixed Pitch vaneaxial:
Capable of working against somewhat more static pressure than the panel fan
More common in industrial applications.
Centrifugal:
With an airfoil bladed wheel
Has high efficiency over a wide operating range
Quieter than previous two.
Major changes in pressure result in only minor changes in volume of air delivered.
Vane axial adjustable pitch:
Takes less space than centrifugal fans
Can work against more static pressure.
The pitch is adjustable occasionally, not continuously
For system balancing or seasonal changes in air volume
Vane axial controllable pitch:
The automatically controlled pitch responds to changes in temp., humidity, air flow, etc., depending on the sensors used.
Commonly used in VAV systems.
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