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FAN-PEDIA

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Twin City Fan & Blower

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Arrangement 7 DWDI — Double Width, Double Inlet (Centrifugal)
Arrangement 7 is direct drive. Like the Arrangement 3, the wheel is mounted between the bearings, but
the 7 incorporates a pedestal designed to accommodate the motor, flexible coupling and one bearing. An
inertia base is an available option.

Arrangement 7DI DWDI — Double Width, Double Inlet (Centrifugal)
Arrangement 7DI is direct drive. Like the Arrangement 3DI, the wheel is mounted between the bearings,
but the 7DI incorporates a pedestal designed to accommodate the motor, flexible coupling and one
bearing. The Arrangement 7DI utilizes integrated inlet boxes to locate the bearings outside of the
airstream allowing for elevated operating temperatures and relatively clean air. A pie split housing is
provided for easy wheel removal. The Arrangement 7DI fan assembly is then mounted on a unitary base
as standard. An inertia base is an available option.

Arrangement 1 (Plenum Fans)
Arrangement 1 features an overhung wheel design suitable for V-belt drive and requires mounting of
motor independent of the fan.

Arrangement 3 – Horizontal (Plenum Fans)
This is the most common plenum fan arrangement is frequently used in OEM and site-built air
handlers. Arrangement 3 is suitable for V-belt drive and requires mounting of the motor
independently of the fan.

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