Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

This is an AMP page - Open full page! for all features.

Types of Fans

Sponsored Links

It is common to classify fans in

  • Axial and/or propeller fans
  • Centrifugal (radial) fans
  • Mixed flow fans
  • Cross flow fans

The pressure head of different types of fans with equal periphery speed of the wheel are compared in the capacity diagram below:

Centrifugal fans with forwarded blades are suited for application with higher air flow volumes and pressures. Axial propeller fans are more suited for applications with lower volumes and pressures.

Axial and Propeller Fans

In an axial fan the air flows in parallel to the shaft. It is common to classify axial fans upon their wheel like:

  • C-wheel - Blades can be adjusted when running. High efficiency, small dimensions, variable air volume
  • A-wheel - Blades can be adjusted only when the fan is standing still. High efficiency, small dimensions, adaptive to recommended air volume
  • K-wheel - Blades can not be adjusted. Simple, small dimensions

The pressure head developed for single stage is up to 300 N/m2. Axial fans are suited for relatively large volumes compared to pressure.


Centrifugal fans (Radial fans)

In a centrifugal fan the air flows is in a radial direction relative to the shaft. Centrifugal fans can be classified by their wheel like:

  • F-wheel - Curved forward blades. High efficiency, small dimensions, changing in pressure have little influence on pressure head.
  • B-wheel - Curved backward blades. High efficiency, low energy consumption, changing in pressure have little influence on air volume. Low noise emission, stable in parallel running.
  • P-wheel - Straight backward blades. High efficiency, self cleaning, changing in pressure have little influence on air volume
  • T-wheel - Straight radial blades. Self cleaning. Suitable for material transport

Types of blades used in centrifugal fans are

  • Straight steel plate paddle wheel
  • Forward multi-vane multi-blade
  • Backward turbo-vane

The different blades can be characterized as shown in the capacity diagram below:

Mixed flow fans

In a mixed flow fan the air flows in both axial and radial direction relative to the shaft. Mixed flow fans develops higher pressures than axial fans.

Cross-flow fans

In a cross flow fan the air flows in an inward direction and then in an outward radial direction.

Sponsored Links

Related Topics

Ventilation Systems

Design of systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more.

Related Documents

Fan AMCA Classification

Fan classification established by AMCA.

Fan Capacity Diagrams

Pressure, head, air flow volume and fan capacity diagrams.

Fans - Calculate Air and Brake Horsepower

AHP - Air Horse Power and BHP - Brake Horse Power.

Fans - Efficiency and Power Consumption

Power consumption and typical efficiencies of fans

Pumps vs. Compressors, Blowers and Fans

The difference between pumps, compressors, blowers and fans.

Types of Fans - Capacity Ranges

Centrifugal, axial and propeller fans and their capacity ranges.

Sponsored Links

Search Engineering ToolBox

  • the most efficient way to navigate the Engineering ToolBox!

SketchUp Extension - Online 3D modeling!

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp from the Sketchup Extension Warehouse!


We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.