Centrifugal Fan Arrangements

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Arrangement #1:
This arrangement is very popular for most applications due to the flexibility and the versatility of discharge positions at time of manufacture. Overhung wheel on shaft-and bearing assembly isolates fan bearings from airstream. Normally this arrangement is used for V-belt-drive fans which provides flexibility in fan performance. Motor mounts independently from fan. See Motor Positions Diagram.
Arrangement #3:
Wheel supported between bearings is compact and suitable for clean, dry-air service. Arr. 3 fans are usually sold for V-belt drive fan applications.
Arrangement #4:
Wheel mounted directly on motor shaft to provide the most compact design. Elimination of shaft and bearings for minimum maintenance.
Arrangement #7:
Wheel supported between bearings is compact and suitable for clean, dry-air service. Arr. 7 fans are usually sold for coupling drive fan applications.
Arrangement #8:
Integral pedestal furnished for the motor and coupling. Most flexible of the direct drive arrangements allowing for larger motors, fan sizes and accessories.
Arrangement #9:
An adjustable motor mount featured on this arrangement provides a compact grouping of motor, drive belt and fan.  The v-belt drive permits a wide variety of fan speeds.  Similar to Arrangement 1, but with motor mounted on side of fan pedestal reducing overall size and field-installation costs.
Arrangement #10:
Compact, packaged design with motor mounted within the fan pedestal. Minimum field installation labor required.

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