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Next, mount the spring bracket at the center of the door ring
assembly where the struts intersect. Use two cable ties to
secure the spring bracket as shown in Figure 20. Attach one
end of each spring to the spring bracket. The other end of each
spring should be attached to the inside door hole in the damper
door.
To check for proper damper operation, open the doors fully,
and allow them to close. If either door fails to close properly,
rotate the cone assembly slightly on the fan orifice until both
doors will close properly.
DOOR & GUARD ASSEMBLY/GUARD MOUNTING
Be sure to install the inlet
guard before operation.
The inlet guard is cut to
size at the factory.
However, a clearance
hole must be cut away
for the motor to easily fit
through, as shown in
Figure 21.
P r i o r
t o
g u a r d
installation, the 3 Guard
Clips and 6 Guard Hooks
must be secured to the
fan frame. The Guard
Clips consist of ‘L’
brackets
that
are
fastened to the top rail of
the fan frame as shown
in Figure 22 (fasteners
not included). The
Guard Clips should be
spaced such that the Guard wire may slip between the
Guard Clip and the frame. The Guard Hooks should be
screwed into the sides and bottom of the fan frame.
Figure 23 shows the suggested locations of the Guard
Clips and Guard Hooks.
With
the
Guard
Clips and Hooks in
place,
complete
final assembly of
the fan by placing
the Inlet Guard over
the Guard Clips,
and
secure
the
Guard
with
the
G u a r d
H o o k s .
Figures 24 & 25
show
the
final
assembled unit.
Figure 24
Spring
Bracket
Cable
Figure 20
Figure 22
Figure 25
Figure 21
Motor
Clearance
27 1/2
25 1/2
12
12
17
17
Figure 23 — Guard Clip & Guard Hook Locations
1
Guard
Hook
Guard
Clip
