CONE MOUNTING
Page 6
After the ring has been
secured, the cone gussets
will be placed on the cone.
NOTE: there are two sets of
two gussets. The longer
set will have a notch on the
end with two holes. The
longer set should be placed
on either side of the cone
drain hole (cone bottom).
The shorter set of gussets
should be placed opposite
the drain hole (cone top).
To attach a gusset, align
the single hole in the gusset
flange with the hole in the
assembly ring and in the
cone at the 45° angles.
Push a 1/4” X 1-1/4” bolt
through the assembly ring,
through the cone, and
through the gusset. Fasten
the bolt with a 1/4” whiz-
lock nut. Repeat this
process for the three other
gussets. Refer to Figure 16
for details. Caulk around
the damper door ring to
prevent light and wind
blown rain water leakage.
To mount the cone assembly, pick the assembly up by the handles and place the top of the smaller end over the fan
panel orifice. Make sure that the drain hole in the cone is at the bottom. Fasten the top cone gussets to the fan
panel using 1/4” X 1-1/4” bolts,1/4” flat washers, and 1/4” whiz-lock nuts. Next, slide the rest of the cone over the
orifice. This process may be aided by gently tapping the sides and bottom of the cone with a rubber mallet or dead-
blow hammer from the inside of the building to allow it to slip over the orifice. Once the cone is in place, fasten the
bottom cone gussets to the fan panel using 1/4” X 1-1/4” bolts, 1/4” flat washers, and 1/4” whiz-lock nuts.
With the cone assembly secured in place, cut and remove the rubber band holding the cable in place and the wires
holding the doors in place. Make sure all 1/4” hardware is tightened securely.
To mount the cone guard, first remove the four bolts/nuts on the guard end of the cone installed during the cone
panel assembly. Then, place eight 1/4” X 2” bolts in the eight holes in the end of the cone
from the outside in
.
Place a Guard Spacer on each bolt and fasten them with 1/4” whiz-lock nuts. These will serve as the Guard Studs.
See Figures 17 & 18. After the Guard Studs have been fastened, mount the Cone Guard by placing the Guard
eyelets over the Guard Studs and fastening each with another 1/4” whiz-lock nut. While installing the Cone Guard,
take the spring at the end of the door restraining cable, and attach it to vertical guard rib as shown in Figure 19.
Figure 16 — Damper Door Ring Assembled in Cone
Door-Restraining Cable End (Top of Cone)
3-O’Clock Hole
9-O’Clock Hole
Long (Notched) Gussets
Drain Hole
Short
Gusset
Short
Gusset
Figure 18 — Guard Stud Detail
Large Diameter
Cone Edge
Guard Studs
Figure 19 — Door Cable
Guard
Stud
Bolt
Cone
Panel
Guard
Spacer
Whiz-
Lock
Nut
Figure 17
