Fan AMCA Classification

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:

AMCA Fan Class	Lower Range		Upper 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.  

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