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

Fan AMCA Classification

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:

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

Example - Classification of Fan

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

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

Related Documents

• Fan Affinity Laws

The affinity laws can be used to calculate resulting volume capacity, head or power consumption when speed or wheel diameters are changed.
• Fans - Calculate Air and Brake Horsepower

AHP - Air Horse Power and BHP - Brake Horse Power.
• Fans - Capacity Control

How to modulate fans and their capacities.
• Fans - Efficiency and Power Consumption

Power consumption and typical efficiencies of fans
• Fans - Noise Power Generation

The sound generated by a fan depends on the motor power, the volume capacity, the static pressure increase and the discharged volume.
• Fans - Volume Flow, Pressure Head and Power Consumption vs. Air Temperature and Density

The temperature and density of the air influences on the volume flow, pressure head and power consumption in a fan.
• Pumps vs. Compressors, Blowers and Fans

The difference between pumps, compressors, blowers and fans.
• Pumps, Fans and Turbines - Horsepower

British Horse Power as used for pumps, fans and turbines - and how to convert to other units.
• Types of Fans

Axial and propeller fans, centrifugal (radial) fans, mixed flow fans and cross flow fans.

Search

Search is the most efficient way to navigate the Engineering ToolBox.

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 older versions of the amazing SketchUp Make and the newer "up to date" SketchUp Pro . Add the Engineering ToolBox extension to your SketchUp Make/Pro from the Extension Warehouse !

We don't collect information from our users. More about

We use a third-party to provide monetization technologies for our site. You can review their privacy and cookie policy here.

You can change your privacy settings by clicking the following button: .

Citation

• The Engineering ToolBox (2005). Fan AMCA Classification. [online] Available at: https://www.engineeringtoolbox.com/fan-amca-class-d_911.html [Accessed Day Month Year].

Modify the access date according your visit.

7.8.15

.