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Fan construction classes established by AMCA
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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
(inches W.G.) |
Outlet Velocity
(feet per minute) |
Static Pressure
(inches W.G.) |
Outlet Velocity
(feet per minute) |
|
| I | 2.5 | 3,400 | 5.0 | 2,415 |
| II | 4.3 | 4,400 | 8.5 | 3,150 |
| III | 6.8 | 5,500 | 13.5 | 4,000 |
| IV | 13.5 | 4,000 | - | - |
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