BCF-103 - page 4

INLET VOLUME
CONTROL
When the fan is used for varying
or partial load applications, the
Inlet Volume Control (IVC) pro-
vides precise air control and
more efficient operation.
Adjustable guide vanes pre-
spin the incoming air in the
same rotation as thewheel to
produce the desired volume of
air at the exact pressure.
Vanes aremounted entirelywith-
in the inlet cone. Automatic con-
trol is achieved by adding an elec-
tric or pneumatic actuator. The
IVC is suitable for manual opera-
tion to 650°F and automatic
operation to 350°F.
PUNCHED FLANGED
INLET/OUTLET
Formed ring inlet is punched
for inlet duct connection. Heavy
angle flange can bewelded to
the outlet, either punched or
unpunched.
INLET COLLAR
Inlet connection collar is available
for slip connection to ductwork or
a flexible joint.
INLET SCREEN
Thewelded steel wire protective
screenmounts within the inlet
cone or outside the Inlet Volume
Control, when furnished.
SHAFT SEAL
A non-contact seal mounted
between steel plates reduces leak-
age through the shaft opening in
the housing.
SHAFT COOLER
ANDGUARD
Cast aluminum coolingwheel
with expandedmetal guard raises
the allowable temperature limit for
arrangement 1 or 9 fans from
300°F to 650°F. Adding a shaft
seal on arrangement 1 fans
extends the limit to 800°F.
Refer to page 6 for high tempera-
ture/RPM deration factors.
OUTLET DAMPERS
Dampers offer an economical
alternative to IVCs. However, they
require substantiallymore horse-
power 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 and are suitable for
manual or automatic operation. A
matching punched flanged outlet
is required for mounting. Alternate
construction is available for dirty
or high temperature applications.
EXTENDED
GREASE FITTINGS
Grease fittings allow for
external lubrication
without removal of shaft
and bearing guard.
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