Axial Flow Fan: Components, Design & General Characteristics

An axial flow fan is a type of industrial fan used to cool machines and equipment which heat up after use. There are AC as well as DC axial flow fans. It may be designed in different ways such as with a duct or a mounting ring, and so on, depending upon the requirement. So, there are different standard designs which can be customized based on your device and installation type. The materials and accessories used for the fan are decided on these and other physical factors such as the environment it would be exposed to, temperature, moisture, pressure, and so on. This post discusses various designs of axial flow fans, and general features.

axial flow fan

Components of Axial Flow Fan

The most basic part of an axial flow fan is the motor. Other than that it has ball bearings, blades, and impellers. The fan has a housing or an enclosure which protects it from external damage, spillage, shock, vibration, and so on. The enclosure is metallic and made of steel, aluminum, or alloys. The impellers are usually made of cast aluminum with black paint, thermoplastic, or steel, and designed to be corrosion resistant. The thermoplastic impellers are generally not considered ideal for commercial applications, so they are usually reserved for residential applications. These fans are designed to be resistant to extreme temperatures, flames, shock, corrosive materials, and so on. A few common accessories of this fan include suitable connecting points, silencer, protection grill, counter flange, vibration controller, feet for the required positioning, and a variable inlet vane.

Designs of Axial Flow Fans

As mentioned, the fan has various standard designs. Here are a few pointers:

  • The fans may be duct mountable or wall mountable.
  • Ducted fans have a duct through for a seamless airflow.
  • The ring mountable fans allow the airflow from one big enough area to another; so, it is suitable for large spaces.
  • The circulator fan has rotating impellers, which are typically used in ceiling fans.
  • Axial flow fans offer large airflow rates at low pressures because of their working principle. The blades of these fans draw air parallel to its axis and move it in the forward in the same direction within the axis of the fan.

Some General Characteristics of Axial Flow Fans

These fans are typically used for sucking hot air from heat generating machines, trenches, and so on. They are also used for ventilation in enclosed spaces. These fans find a great application in quiet zones. Here are some general features of axial flow fans.

  • These fans have a wide size range from 25mm to 250mm.
  • These fans usually have ball or sleeve bearings which can last up to as high as 50,000 hours and at reasonably high temperatures.
  • Their operating range is usually from -10 to +70, depending upon the bearing type.
  • They operate quietly without noise, and have a good dielectric strength.
  • They require minimal power input to operate.
  • Apart from cooling industrial equipment, they find applications in diverse segments such as snow making machines, vending machines, refrigeration systems, HVAC systems, and so on.

If you are an OEM and have newly installed equipment which require axial flow fans, ensure you source them from a reliable manufacturer and supplier. Also, ensure they have features which meet your specifications. Sofasco designs, develops, and manufactures AC and DC axial fans in a huge size range, along with other integrated cooling solutions which can be customized to suit your requirements.