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Types of Fans - Capacity Ranges

Centrifugal, axial and propeller fans and their capacity ranges.

Common types of fans and their characteristics are summarized in the table below:

Fans - Capacity Ranges
Fan TypeWheel TypeStatic Pressure
(in H2O)
Wheel Diameter
Air Flow
Brake Horse Power
Centrifugal Backward Inclined 0 - 12 10 - 75 500 - 125000 0.33 - 200
Backward Inclined Airfoil 0 - 14 20 - 120 1500 - 450000 0.33 - 1500
Propeller Axial Direct Drive 0 - 1 10 - 50 50 - 50000 0.17 - 10
Tube Axial Direct Drive 0 - 1 20 - 50 2500 - 50000 0.33 - 15
Tubular Centrifugal Backward Inclined 0 - 10 10 - 110 500 - 350000 0.33 - 750
Vane Axial Direct Drive 0 - 5 20 - 60 1200 - 150000 0.33 - 150
  • Centrifugal - flow within the fan is mainly radial to the shaft
  • Axial - flow within the fan is mainly parallel to the shaft

Brake horsepower is the actual power delivered to or by a shaft.

Centrifugal Fans

The centrifugal fans operates by throwing air away from the blade tips. The blade wheel are mounted in housing and the blades can be forward curved, straight, or backward curved.

centrifugal fan

Backward curved blades are generally more efficient and non-overloading.

The centrifugal fans are preferred before axial fans where high airflow rates and high static pressures are required.

Axial Fans

Tube-axial fans consists of propeller-shaped blades and a drive motors mounted in tubes. The fans are in general build to be implemented in the duct work.

Vane-axial fans are variations of the tube-axial fans with air straightening vanes added in front of or behind the propeller blades.

axial fan

A propeller-axial fan consists of a a propeller-shaped blade and a drive motor mounted on a flat frame. The construction is often build to be installed in a wall or located individually in the room.

Related Topics

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    Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

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