Twin City Modular Gravity Hood - MGR, MGI - IM-4720NFS - Manual (Page 2)

2 Twin City IM-4720NFS
Step 1 – Base Assembly
Fasteners (Kit #1A and #1C) – Note: There may
be extra fasteners.
Lay out the Curb Base Side and Curb Base
End in approximate location to each other. See
Figure 2. Use (3) 1/4-20 fasteners for 5" base
height and (4) 1/4-20 fasteners for 12" base
height. Leave top two holes open on the Base
End. Note: Hand tighten only until Step 3. On
some hoods, a Doubler Plate is required. See
Detail A in Figure 2.
Hex Nut
Screw
Curb Base End
Curb Base Side
Doubler Plate
DETAIL A
Step 2 – Hood Mount Bars
Fasteners (Kit #1A and #1C)
Loosely assemble Hood Mount Bars on both sides of the Curb Base Ends using (4) 1/4-20 fasteners per side. On
hoods using a Doubler Plate, mount Brace using 5/16-18 hardware. See Figure 3b.
Step 3 – Caulk
Caulk inside corners of base assembly and tighten all fasteners. Install assembly onto roof curb before proceeding.
Ensure that assembly is properly anchored to roof curb.
Hood Mount Bar Hood Mount Bar
Brace
* When Kit 1C provided.
Figure 2.
Figure 3a. Figure 3b.
Step 4 – Birdscreen
Fasteners (Kit #2) – Note: There may be
extra fasteners.
Install nut clips onto Hood Mount Bars as
shown. Center Fixed Birdscreen on assem-
bly with equal overhang on both sides.
Attach using (4) 1/4-20 x 3/4" fasteners
per birdscreen as shown.
Overhang
Overhang
Fixed Birdscreen
Extension Tab
Nut Clip
Screw
Hood Mount Bar
Figure 4.