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

2 Twin City IM-4720NFL
Step 1 – Base Assembly
Fasteners (Kit #1B and #1C) – Note: There may
be extra fasteners.
Lay out the Curb Base Side, Hood Support
Assembly 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. Bolt together Curb Base Sides
to Hood Support Assembly with (8) 1/4-20 fas-
teners per Hood Support Assembly for 5" bases
and (10) 1/4-20 fasteners for 12" bases. On
some hoods, a Doubler Plate is required. See
Detail A of Figure 2. For base assemblies with
more than one Hood Support Assemblies, orient
top flanges away from center.
Curb Base End
Curb Base Side
Hex Nut
Screw
Hood Support Assembly
Curb Base Side
Curb Base Side
Curb Base Side Curb Base End
Step 2 – Hood Mount Bars
Fasteners (Kit #1B and #1C)
Loosely assemble Hood Mount Bars on both sides of the 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
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 in Detail
A of Figure 4. If birdscreen
is split, bolt sections together
to get correct tab orientation
as shown in Figure 4. Center
Fixed Birdscreen on assembly,
with equal overhang on both
sides. Attach using (4) 1/4-20
x 3/4" fasteners per birdscreen
as shown.
Overhang
Overhang
Fixed Birdscreen
Ensure overhang is equal
on both ends
Screen tabs to be located at
each end to support center screen
Nut Clip
Flanged Head Screw,
1/4-20 X 3/4" LG
Flanged Head
Screw,
1/4-20 X 3/4" LG
Nut Clip
Flanged Head Screw
1/4-20 X 3/4" LG
1/4-20
Flanged Hex Nut,
Hood lengths longer
than 108" require 2
or more screens to
be bolted together
and then installed.
DETAIL A
Figure 4.
Doubler Plate
DETAIL A