DFOS-103 - page 4

Inlet Volume Control
The Inlet Volume Control (IVC) provides precise
air control andmore efficient performance at
partial loads. Adjustable guide vanes pre-spin
the incoming air in the same rotation as the
wheel to produce the desired volume of air
at the exact pressure. Vanes aremounted
entirely within the inlet cone.The IVC is suitable
for manual or automatic operation.
Slip Inlet
accessory that
facilitates the
attachment of
flexible connec-
tors, dampers or
ductwork to the
fan inlet.
Continuously welded angle
facilitates the attachment of flexible
connectors, dampers or ductwork to the fan discharge.
Inlet/OutletCompanion Flanges
Structural angle assembly matches fan inlet or outlet
flanges and allows fastening of ductwork for a flange-to-
flange connection. Neededwith flanged inlet or outlet.
Inlet Screen
Welded steel wire screenmounts within the inlet cone
or outside the inlet vanes when furnishedwith Inlet
Volume Control.
Shaft Seal
The compressed sheet seal mounted between steel
plates is designed to reduce leakage through the drive
side shaft opening. Shaft seals are not gas tight.
Shaft Cooler and Guard
Cast aluminumcoolingwheel split for installationwith
guard. Required for temperatures above 300°F.
Housing Drain
A half coupling is welded to the lowest
point of the housing. Availablewith or
without drain plug.
Adjustable Motor Base
Simplifies belt tension adjustments. Base is mounted on
the fan’s base side (A/9) or on a unitary base (A/9H).
Outlet Dampers
Dampers offer an economical alternative to IVCs.
However, they require substantially more horsepower
at reduced air volume. Dampers for all fan classes have
double thickness airfoil blades, and are availablewith
parallel or opposed blade rotating louvres.
Dampers have punched flanges on both ends to simplify
fan and duct connections. Matching punched flanged
outlet is required for mounting.
Performance and
Convenience Options
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