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FAN-PEDIA

Published by TECHNICAL DESCRIPTIONS

Twin City Fan & Blower

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

Arrangement 7SI SWSI — Single Width, Single Inlet (Centrifugal)
Arrangement 7SI is direct drive. Like the Arrangement 3SI, the wheel is mounted between the
bearings. The Arrangement 7SI includes an integrated inlet box to locate the bearing outside of the
airstream. The pedestal is designed to accommodate the motor, flexible coupling and one bearing. A
pie split housing is provided for easy wheel removal. The fan assembly is then mounted on a unitary
base as standard. An inertia base is an available option.

Arrangement 8 SWSI — Single Width, Single Inlet (Centrifugal)
Arrangement 8 is a modified version of Arrangement 1 used for direct drive. The Arrangement 1
bearing pedestal is extended to accommodate the motor. A flexible coupling connects the fan and
motor shaft.

Arrangement 9 SWSI — Single Width, Single Inlet (Centrifugal)
Arrangement 9 is available as belt driven only. A motor slide base is mounted on the side of the
bearing pedestal. This arrangement permits the unit to ship as a complete assembly with the motor
and drive mounted. Typically, the motor is mounted on the left side of the pedestal for CW rotation
fans and on the right side for CCW rotation fans.

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