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Twin City Fan & Blower

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Arrangement 10 SWSI — Single Width, Single Inlet (Centrifugal)
Arrangement 10 is available as belt driven only. For Class I and II fans, sizes 122 through 365,
Arrangement 10 units are commonly referred to as Ventilating Sets. (Refer to Catalog 600 for more
details.) Arrangement 10 units have adjustable motor bases mounted inside the bearing pedestal. This
arrangement offers a more compact design than the Arrangement 9 and is suitable for roof or outdoor
installations when supplied with the optional weather cover.

Arrangement 3 DWDI — Double Width, Double Inlet (Centrifugal)
DWDI fans are generally supplied in Arr. 3 for V-belt drive. The wheel is mounted between the
bearings and supported by the fan housing. Since both bearings are located in the airstream, standard
DWDI fans should be used for clean air applications with air temperatures limited to 130°F. The motor
can be mounted in any of the four standard motor positions: W, X, Y or Z.

Arrangement 3DI DWDI — Double Width, Double Inlet (Centrifugal)
Arrangement 3DI is direct drive. Like the Arrangement 3, the wheel is mounted between the bearings.
The Arrangement 3DI utilizes integrated inlet boxes to locate the bearings 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.

Arrangement 3F DWDI — Double Width, Double Inlet (Centrifugal)
Arrangement 3F offers an integral extended base to accommodate the motor. The base has brackets
to accept vibration isolators. Arr. 3F is available to Size 660 and for motor positions W and Z as
standard. For motor positions X and Y, consult factory.

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