Types of centrifugal fans and the selection of suitable fans

June 21, 2022

TABLE OF CONTENTS

Centrifugal fans have wide applications in industrial parks, high-rise buildings. Learn about the types of centrifugal fans, from which to choose the right centrifugal fan for your needs.

A centrifugal fan is a flexible air-moving device. They can move air at different speeds, and different flows thanks to the structure of the fan.

Types of centrifugal propellers

The first is based on the type of propeller. Centrifugal fans use 4 main types of blades as follows:

First, radial blade

Radial blade impeller used for high-pressure centrifugal fans. Returns average airflow. Best used for industrial areas, where there is a lot of dust or in environments with hot and humid air.

Second, Forward-curve

Using Forward Curve blades for centrifugal fans requires medium pressure and large airflow. Use for clean air environment, use for ventilation, cooling.

Third, Backward-curve

Installation for fans requires high pressure, large flow, and high efficiency. With the curved wing design, inclined to the back, it can move air, dirt, and gas carrying small amounts of corrosive materials and high temperatures. Backward-tilt centrifugal fans are more efficient than forward-curved fans. With the blades tilted back, the fan reaches peak power consumption and then drops within the usable airflow range. They can change the static pressure without overloading the motor.

Fourth, Airfoil type

They are similar to curved wings that lean forward or backward. Brings the best effect when used. Use the best efficiency for clean air environments.

Here is a comparison table of 4 common types of wings:

Type	Characteristics	Applications
Radial	Medium flow, high pressure. The power increases continuously, the performance is close to that of the tube axial fan.	Suitable for industrial applications: areas with dirty air, high humidity.
Forward-curve	Application of vacuum cleaner, odor absorber, humid air etc. in industry	Low pressure HVAC, packages units, suitable for clean and dust laden air/gases
Backward-curve	High flow, medium pressure. Higher efficiency than radial fans. Continuously increasing capacity	Application of cooling ventilation, HVAC system etc.
Airfoil type	Same as backward curved type, highest efficiency	Same as backward curved, but for clean air applications

In other words, centrifugal fans can be classified into 3 main types:

– Low-pressure centrifugal fan

– High-pressure centrifugal fan

– Medium-pressure centrifugal fan

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Centrifugal fan speed

Choosing the right centrifugal fan needs to determining the required pressure of the fan. With a long and complex pipeline system, higher pressure is required, and vice versa. The speed of fan rotation depends on the speed of the motor. Here are 2 types of centrifugal fans based on the structure of the motor.

First, the direct-drive centrifugal fan

The direct centrifugal fan operates with a direct drive, as the motor is connected directly to the fan shaft. As a result, it brings fast rotational speed, large traffic. Fan structure is simple, with fewer assembly components, and higher efficiency.

Second, indirect drive centrifugal fan

Indirect-drive centrifugal fan is a centrifugal fan with a motor structure connected to the impeller through belts, bearings, and supports. Offers more flexibility in meeting airflow requirements.

Above we provide some information about types of centrifugal fans. Depending on the needs of users, the size and area of the centrifugal fan used. Choose the appropriate centrifugal fan.

If you are choosing to buy a centrifugal fan, contact System Fan Global for advice.