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FAN-PEDIA

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Twin City Fan & Blower

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Arrangement 3SI SWSI — Single Width, Single Inlet (Centrifugal)
Arrangement 3SI is usually direct drive. Like the Arrangement 3, the wheel is mounted between the
bearings. The Arrangement 3SI utilizes an attached inlet box to locate the bearing outside of the
airstream on independent bearing pedestals which allows for elevated operating temperatures and
relatively clean air. The Arrangement 3SI includes a pie split housing for easy wheel removal. The
motor is located by the customer off the fan assembly and direct coupled to the shaft opposite of the
inlet box side.

Arrangement 4 SWSI — Single Width, Single Inlet (Centrifugal)
Arrangement 4 is a direct drive fan. The wheel is mounted directly to the motor shaft with the motor
mounted to a pedestal. Arrangement 4 offers low maintenance since there are no fan bearings, fan
shaft or drive parts to maintain. Arrangement 4 fans are typically limited up to size 365.

Arrangement 4S (Swingout Construction) SWSI — Single Width, Single Inlet (Centrifugal)
Arrangement 4S is a modified Arrangement 4 fan intended for easy access to the wheel and housing
interior. The motor and wheel assembly is mounted to reinforced framework to support the opened
housing.

Arrangement 4VI (Vertical) SWSI — Single Width, Single Inlet (Centrifugal)
Arrangement 4VI is a modified Arrangement 4 fan designed to mount directly on the inlet of the fan.
The Arrangement 4VI and features reinforced inlets and removable motor side to allow the rotating
assemblies to be removed without removing the housing from the mounting structure. Arrangement
4VI fans utilize a vertical airflow into the fan (vertical motor shaft).

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