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The helical fan is made up of a sheet drum inside of which an impeller rotates driven by an external power source (normally an electric motor). The impeller can be directly keyed on the motor or on a bearing for the belt drive. The main features of a fan are as follows:
a

flow rate

It is represented by the volume of fluid sucked by the fan in the time unit;

It is normally expressed in m³/sec, m³/min o m³/hour.
b

pressure

The pressure generated by a fan is called TOTAL pressure (pt); it represents the sum of two different pressures: STATIC + DYNAMIC. The static pressure (ps) is the potential energy to win the resistances set by the circuit against the fluid flow. The dynamic pressure (pd) is the kinetic energy of the moving fluid and depends on the average delivery speed of the air from the impeller inlet. It is normally expressed in kgf/m² or Pa.
c efficiency

It is the ratio between the energy provided by the fan to the fluid and the energy used by the external source to operate the fan.
d rotation speed

Is represented by the number of revolutions per minute the impeller has to make to provide the characteristics required.

 

Axial flow fans - direct coupling
Flow rate Pressure Models Conveying
Stale air
Stale air
Stale air (2 motors)

 

Axial flow fans - belt driven
Flow rate Pressure Models Conveying
Stale air

 

Axial exhaust towers
Flow rate Pressure Models Conveying
Stale air

 

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