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Centrifugal Fans

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A key factor in many industrial applications is directional airflow, which is necessary for removing dust, gases, pollutants, and for the safety of workers. Though axial fans could do the job, they are not capable of providing the required directionality and control. In those conditions, the tool that is the most efficient and provides the airflow characteristics needed for the application is a centrifugal fan. Read More…

Centrifugal Fan A centrifugal fan has a spiral casing that contains an impeller that is attached to the motor. Two ducts allow air to enter and exit the fan casing. One duct pulls air in while the other duct discharges the air. The tight, uniform construction of the fan increases the pressure of the airflow as it leaves the fan.
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Leading Manufacturers

Syracuse, NY  |  888-293-7434

Since 1991, National Turbine Corporation has been a blower manufacturer, bringing you quality multi stage blowers for use in industrial applications.

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National Turbine Corporation $$$

Rhinelander, WI  |  715-365-3267

As an industrial fan manufacturer, we design, build, and deliver (including installation support) heavy duty centrifugal fans and blowers. We serve industrial customers who need equipment for their operations, and OEM customers who supply equipment to industrial customers. We also provide service, retrofit and repair in the field, not only for our own products and current customers, but also for products made by any other industrial fan manufacturer.

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AirPro Fan & Blower Company $$$

Scotia, NY  |  518-372-2496

With over 20 years of experience in the compressor business by the former TSC company and more than a century of experience in fan business by Piller. The combination of both makes Piller TSC the first address in designing, serving and repairing rotating equipment. We also refurbish, repair and service turbo compressors of all kinds.

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Piller TSC Blower Corp $$$

Piqua, OH  |  800-336-3267

If you are looking for a solution solving industrial blower supplier, look to Hartzell Air Movement. We have been an industrial blower manufacturer for 75 years & carry products such as air blowers, exhaust fans, industrial fans, centrifugal blowers & high velocity fans for the air moving community. At Hartzell, our mission is to provide high quality & reliable industrial air moving equipment & services.

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Hartzell Air Movement $$$

Glendale Heights, IL  |  630-858-2600

Chicago Blower offers a wide range of products and services. We provide many industries with quality industrial blowers, industrial fans, high pressure fans and fan components. We are ISO 9001 certified and have almost 75 years of experience in the designing and manufacturing pre-engineered field. Let Chicago Blower’s knowledgeable staff help you choose the best industrial blower for your company. No matter the difficulty or specialty of a fan is too hard for us. We strive the exceeded customer’s expectations.

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Chicago Blower Corporation $$$
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Unlike axial fans, centrifugal fans pull air in and change its angle of discharge, a process that increases the velocity and pressure of the air. The design allows for accurate control of the airflow pattern.

What is a Centrifugal Fan?

A centrifugal fan has a spiral casing that contains an impeller that is attached to the motor. Two ducts allow air to enter and exit the fan casing. One duct pulls air in while the other duct discharges the air. The tight, uniform construction of the fan increases the pressure of the airflow as it leaves the fan.

When a centrifugal fan is activated, the impeller pulls ambient air in through the inlet duct. The blades of the impeller catch the air and increase its velocity by their rapid rotation. The swirling airflow moves from the center of the impeller to its outer edges and is expelled through the outlet duct at higher pressure and speed.

The advantage of centrifugal fans is their ability to control the pressure, velocity, and direction of the airflow such that it can be applied to a specific location. This feature is essential for industrial operations that involve dust, gases, and contaminants.

Types of Centrifugal Fans

Centrifugal fans are classified by the types of blades on their impeller and the drive of their motor. Impeller blades can be divided into four categories – airfoil, backward curved, forward curved, and radial. The difference between the types of blades is determined by the air pressure they create.

Radial blades are used in industrial applications where there is a great deal of dust, gases, or humidity. Fans with radial blades produce high air pressure from a medium airflow.

An airfoil fan has blades in the shape of an airfoil. They provide the highest efficiency and are used in chemical factories, power plants, and metal factories. Airfoil fans are capable of operating in high temperature environments that have harsh conditions.

The impeller of a forward curved fan looks like a squirrel cage. They generate the highest amount of airflow and are used in high temperature applications, such as furnaces, where there is dust or particles in the air.

Backward curved fans have the same characteristics as airfoil fans including the same efficiency. The backward curvature of the blades helps avoid dust and contaminant buildup. They are normally chosen for high pressure applications.

Types of Centrifugal Fan Drives

The two types of drives are direct and belt. The choice of which drive depends on the fan manufacture and how the fan will be used. Belt drives are the most common.

Direct dive fans have the motor connected to the shaft of the impeller. They have a very compact design and are easy to maintain. Direct drive fans are smaller and have a low cost with exceptional efficiency.

The more common belt driven fan has the motor connected to the shaft of the impeller by a pulley. They have greater flexibility and can match any set of airflow requirements. Belt driven fans are larger and have variable pitch motors.