Fan Classification - AMCA

Fan classification established by AMCA

AMCA - Air Movement and Control Association International fan-class standards are established to simplify the specification of fans. AMCA fan-class standards are based on fan horsepower required per square foot of outlet area representing the structural requirements imposed on a fan for a given set of operating conditions.

AMCA class limits for a double-width airfoil centrifugal fan:

Fan Class
Lower RangeUpper Range
Static Pressure
(in W.G.)
Outlet Velocity
Static Pressure
(in W.G.)
Outlet Velocity
I 2.5 3200 5.0 2300
II 4.25 4175 8.5 3000
III 6.75 5256 13.5 3780

AMCA Fan Classes I II III - Static Pressure vs. Outlet Vleocity

Example - Classification of Fan

AMCA Fan Classes I II III - Static Pressure vs. Outlet Vleocity - Example

A fan working with static pressure 4.5 in W.G. and outlet velocity 3500 ft/min is within AMCA Fan Class II.  

Related Topics

  • Ventilation - Systems for ventilation and air handling - air change rates, ducts and pressure drops, charts and diagrams and more

Related Documents

Tag Search

Search the Engineering ToolBox

- "Search is the most efficient way to navigate the Engineering ToolBox!"

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your SketchUp model with the Engineering ToolBox - SketchUp Extension/Plugin - 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!

Translate the Engineering ToolBox!
About the Engineering ToolBox!