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Hooded Tubeaxial Roof Fans
(Non-Filtered)
INSTALLATION & ASSEMBLY MANUAL
IM-4850NF
September 2009
Panel End Assy, Male 1 1 1 1 1 1 1 1 1 1 1
14 16 18 21 24 30 36 42 48 54 60
Panel End Assy, Female 1 1 1 1 1 1 1 1 1 1 1
Hood Panel 2 2 2 2 3 5 5 6 7 7 8
Hood Side Rail Assy 2 2 2 2 2 2 2 2 2 2 2
Hood Gusset 0 0 0 0 0 4 4 4 4 4 4
Hood Clip 0 0 0 0 0 0 0 0 0 16 18
Hood Mount Bar 2 2 2 2 2 2 2 2 2 2 2
Bird Screen Assy, Fixed 2 2 2 2 2 2 2 2 2 2 2
Bird Screen Assy, Removable 2 2 2 2 2 2 2 2 2 2 2
HDWRKIT-LH01 Hardware Kit #1 - Hood
Qty Item
12 Cap Screw, Serrated Flange Hex, 3/8-16 x .75
20 Hex Nut, Serrated Flange, 3/8-16
4 Cap Screw, Serrated Flange Hex, 3/8-16 x 1.25
72 Screws, #12
Fan Size/Qty
HDWRKIT-LH06 Hardware Kit #6 - Mesh Bird Screen (Size 24 to 60)
Qty Item
10 Cap Screw, Serrated Flange Hex, 5/16-18 x .75
6 Nut Clip, 5/16
4 Hex Nut, Serrated Flange, 5/16-18
• Fan sizes 14 to 42 are shipped fully assembled, unless otherwise specified.
• A minimum of two people are required for assembly. Before starting, review these instructions.
• The following tools are required:
- Powered screwdriver (preferred), or drill
- 3/8, 7/16, 1/2, 9/16 wrenches and sockets
- 5/16" nut driver bit for powered screwdriver
- Awl, for hole alignment
Inspect for missing or damaged parts
Hood Side Rail Assy
Bird Screen Assy, Fixed
Hood Gusset
End Panel
Assy, Female
Bird Screen Assy, Removable
End Panel
Assy, Male
Hood Panel
Bird Screen Assy, Removable
Hood Side Rail Assy
Bird Screen Assy, Fixed
Hood Mount Bar
Hood Clip (Size 54 and 60)
©2009 Twin City Fan Companies, Ltd.
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Hood Gusset
3/18-16 x 1.25
Cap Screw
Hood
Mount
Bar
Nut
Hood
Mount
Bar
Step 1 – Install Hood Mount Bars
and Gussets
Fasteners (Kit #1):
Cap Screw, Serrated Flange, 3/8-16 x 0.75
Hex Nut, Serrated Flange, 3/8-16
3/8-16 x .75
Cap Screw
Hood Gusset
Bird Screen
Assy, Fixed
5/16-18 Nut
Hood Gusset
Hood
Gusset
5/16-18
Cap Screw
Bird Screen
Assy, Fixed
A. Assemble Hood Mount Bars, both sides,
using cap screws and nuts.
B. Assemble four Hood Gussets to Hood Mount
Bars and fan housing using cap screws and
nuts.
Step 2 – Install Fixed Screens
Fasteners (Kit #6):
Cap Screw, Serrated Flange, 5/16-18 x 0.75
Hex Nut, Serrated Flange, 5/16-18
A. Install two Fixed Screen Assemblies using
cap screws and nuts. Do not fully tighten
these fasteners. They will be fully tightened
in the next step.
Removable
Screen Assy
Step 3 – Install Removable Screens
A. Install two Removable Screen Assemblies.
After positioning the assemblies, rotate the
locking tabs in place and tighten.
B. Fully tighten the Fixed Screen assembly fas-
teners from the previous step.
Removable
Screen Assy
Locking Tab,
rotate into place
and tighten
Detail of locking tabs
2 Twin City IM-4850NF Twin City IM-4850NF 3
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3/18-16 x 1.25
Cap Screw
and Nut
Hood
Side
Rail
Assy
End Panel Assy,
Male
Hood
Side
Rail
Assy
Step 4 – Install Hood Side Rails
Fasteners (Kit #1):
Cap Screw, Serrated Flange, 3/8-16 x 1.25
Hex Nut, Serrated Flange, 3/8-16
A. Install two Hood Side Rail Assemblies to the
Hood Mount Bars using cap screws and nuts.
Do not fully tighten fasteners. They will be
tightened in Step 7.
Step 5 – Install End Panel Assy
(Male)
Fasteners (Kit #1):
Screws, #12
A. Install the End Panel Assembly (male type)
using #12 screws.
IMPORTANT
be male. Refer to the detail below.
- This flange must
Male Flange
(Narrow)
Step 6 – Install Hood Panels
Fasteners (Kit #1):
Screws, #12
A. Install the Hood Panels using #12 screws.
B. On sizes 54 and 60, hood clips must be
Hood Panels
End View of Panel
End View of Panel
Female Flange
(Wide)
installed at each interlocking rib while installing the panels. Position the Hood Panel in
place and reach underneath to slide the clip
into place.
For Sizes 54 and 60,
install hood clips at each rib.
#12
Screws
Hood
Panels
Hood Clip
Hood Side
Rail Assy
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End Panel
TM
®
Assy,
Female
Step 7 – Attach End Panel Assy
(Female)
Fasteners (Kit #1):
Screws, #12
A. Attach End Panel Assembly (female type),
using #12 screws.
B. Fully tighten the Hood Mount Bar/Side Rail
fasteners from Step 4.
This flange must
be female
Screen Clip
#12 Screw
Step 8 – Install Screen Clips (Size 54
and 60)
Fasteners (Kit #1):
Screws, #12
A. For fan sizes 54 and 60, add screen clips to
underside of hood using #12 screws.
Step 9 – Check All Fasteners
A. Check that all fasteners are fully tightened.
1MW09/09
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