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:
|Lower Range||Upper Range|
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.