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FAN-PEDIA

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Twin City Fan & Blower

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Bases – Inertia Base (Concrete Filled)
Provides a common support to fan, motor and drive including guards and utilize heavy duty structural
channel with spring isolators. Inertia bases incorporate reinforcing rods (rebar) and require customer
supplied concrete. Inertia bases are typically used on longer, direct drive fans to mitigate assembly
deflection, maintaining proper alignment between the motor, coupling, shaft and bearings. Flexible
connectors at inlet and outlet are required. Shown with optional bottom pan to allow for easier filling
of concrete in the field.

Bases – Isolation Base
Provides a common support to fan, motor and drive including guards and utilize heavy duty structural
channel. Vibration isolation bases require spring or rubber-in-shear type isolators that are designed to
limit forces transmitted to the support structure of an operating fan. Flexible connectors at inlet and
outlet are also required.

Bases – Unitary Base
Utilizes structural channel to support the fan assembly and are designed for use without isolators.

Bearings: Solid Pillow Block Bearing (Ball Type Rolling Element)
Pillow block bearings are designed to provide shaft support where the mounting surface is parallel to
the shaft axis. The bolt holes are usually slotted for adjustment during mounting. Ball Type Pillow
Block Bearings have a ball as the rolling element. They are used to provide smooth, low friction
motion in rotary applications.

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