Centrifugal Fans

Centrifugal fans are widely used for many and various commercial and industrial applications today. These fans are the choice for heating, ventilation, and air conditioning (HVAC), air handling systems, forced draft & induces draft systems in nearly all industries for several reasons; centrifugal fans have excellent aerodynamic qualities, high efficiency levels and are capable of reaching up to 86% efficiency.

 

Centrifugal fans have an airflow that is pulled in along the axis and then thrust out perpendicular to the axis.

When choosing a centrifugal fan, you will have to consider factors such as what airflow rate is required, the static pressure required for the system and the air/gas conditions.

Factors you need to consider are: Clean, dirty, dry, or wet air and its temperature.

 

Types of Centrifugal Fans

Airfoil Fans

Airfoil fans have the highest efficiencies and are named after the style of blades they utilize. Designed for applications with high airflow volumes and also fairly high-pressure adaptabilities. Airfloil fans operate with clean air/gas and tend to be the quietest of all centrifugal fans. Airfoil fans offer static efficiency up to 86%. They have a non-overloading power curve. Airfloil fans are commonly used for large HVAC and large industrial clean air systems that require the high efficiency.

Backward Curve Fans

Backward curved fans are essentially the same as backward inclined blades. The blades lie backward with a gentle radius. More efficient that Backward inclined Fans and almost as efficient as airfoil they make an excellent choice for a non-overloading high volume medium pressure fan.

Backward Inclined Fans

Backward inclined fans have single thickness or laminar blades. These fans are less efficient (with up to 80% static efficiency) but are tougher in that they can handle light loads of dirty/dusty air. Backward inclined fans are also offered for the high airflow and low-pressure/ medium, low-noise, and also have a non-overloading curve. Backward inclined fans can be used for HVAC and are better suited for corrosive or erosive industrial applications.

Radial Bladed Fans & Radial tips

The blades of these fans are or end up radially to the fan’s shaft.  Straight radial blade fans tend to be used in lower airflow, higher-pressure applications. Radial bladed fans include a simple paddle blade with effect up to 65% shrouded radial blade with effect up to 72% and radial tip fans yielding efficiency up to 75%

All radial blades tend to have self-cleaning characteristic efficiency and are suited to material handling. Usually a heavy build quality which yields good life and relatively early maintained

Forward Curved Fans

Forward curved fans are multi bladed with small radius blades that are curved in the direction of the wheel’s rotation. These fans are primarily for high volume and low pressures. With static efficiency, up to 65%. Forward curved fans require the lowest speed to move air and they are generally available in smaller size selections. These low noise fans are ideal for low pressure, high temperature, and clean applications.

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