Twin City Modular Gravity Hood - MGI with Filters - IM-4720FSS - Manual (Page 2)

2 Twin City IM-4720FSS
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 – Filter Rails
Fasteners (Kit #6A) – Note: There may be
extra fasteners.
Attach Filter Channel, Type -A- to the
Hood Mount Bar using cap screws and
nuts (hand tight). Lay Filter Channels,
Type -B- onto assembly and wedge Filter
Stop Plate between them and the Base
Assembly. Assemble with cap screws and
nuts (hand tight).
Screw, Hex Head
Hex Nut, Flanged
Filter Rail, Type -A-
Base Assy
Filter Stop Plate
Filter Rail, Type -B-
Figure 4.