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Ductwork
Exhaust
As specified in NFPA 96, Ch. 7.5 (latest edition),
Threaded Rod
exhaust duct systems must be constructed in the
following manner:
Materials: Ducts shall be constructed of and
supported by carbon steel not less than 1.37 mm
(0.054 in.) (No. 16 MSG) in thickness or stainless steel
not less than 1.09 mm (0.043 in.) (No. 18 MSG)
Option #2
in thickness.
The uni-strut (U channel) that holds the hood up,
cantilevers over the end of the hood and is
mounted to the Air Curtain Supply Plenum (ASP)
Installation: All seams, joints, penetrations, and duct
hanger brackets
to hood collar connections shall have a liquid-tight
external weld. If you have an Automatic Fire Damper
please refer to that manual for installation instructions
END VIEW
now.
Supply
Supply ductwork (where applicable) should be
Hood
connected to the hood in a manner approved by the
local code authorities.
For proper installation of duct collars when they are
shipped unattached see Installing Duct Collars on
Option #1 : Hanging Clip
page 10.
'C' Clamp
Hood Standing Seam
Hanging Clip bolted to plenum shell
For hoods with fire dampers in the exhaust and
supply duct collars, an access panel for cleaning
and inspection shall be provided in the duct. This
panel shall be as close to the hood as possible but
HOOD FRONT
SUPPLY PLENUM SHELL
should not exceed 18 in. (45.72 cm).
If Option #1 is not applicable, use Options #2 or #3
®
Option #3
Threaded Rod
supplied by others
NOTE
Hanging Clip
Installing External Supply Plenums
UTILITY
Hanging methods for supply plenums
ASP: Air Curtain Supply Plenum
CABINET
FSP: Face Supply Plenum
VSP: Variable Supply Plenum
Option #1: Hanging Clip
Option #2: Uni-Strut
Option #3: Threaded Rod
11.5
23.5
Option #1
Hanging clip could be 23.5 inches from end if there is a utility cabinet on the
end of the hood.
Using the Supply Plenum Clip - Option #1
1. Bolt the hanging clip to the supply plenum. Two
1.375
1.000
2.125
clips are needed for plenums less than 96 in.
0.625
Option #2
.500 x .375
(243.84 cm) long and three for plenums greater
SLOT (3 PLACES)
The uni-strut (U channel) that holds the hood up,
cantilevers over the end of the hood and is
than 96 in. (243.84 cm). The
3.000
mounted to the Air Curtain Supply Plenum (ASP)
1.000
hanger brackets
third clip is located in the
1.500
1.000
center of the plenum length.
0.625
0.750
If there is a utility cabinet,
4.500
END VIEW
the hanging clip should be
HANGING CLIP
2.120
23.5 in. (59.69 cm) from the
1.000
147.0°
end to the hood.
57.4°
2. Using the c-clamps provided, clamp the supply
HOOD FRONT
plenum hanging clip to the hood standing seam.
Option: Drill and bolt a 1/4-20 SS bolt through the
clip and hood standing seam.
Option #1 : Hanging Clip
'C' Clamp
Hood Standing Seam
HOOD FRONT
Note: Supply plenums are standardly supplied with hanging clips (Option #1).
The supply plenum is provided with plenum clips
If Option #1 is not applicable, use Options #2 or #3
that assist in hanging the plenum. The plenum
should not be hung only with the plenum clips;
threaded rod or uni-strut must also be used.
Option #2
Uni-Strut supplied by others
TOP VIEW
HOOD
Option #1
For plenums < than or = 96 inches
Two (2) clips are needed.
For plenums > than 96 inches
Three (3) clips are needed.
The third clip is located in the
center of the plenum length.
Option #1
Attach hanging clip to hood
standing seam with the
supplied 'C' clamps.
Optional: Drill and bolt a
1/4-20 SS bolt through the
clip and hood standing seam
TOP VIEW
SUPPLY PLENUM
Hanger Bracket
Threaded Rod
0.750
0.563
0.563
Supply Plenum Clip
SUPPLY PLENUM SHELL
Hood
Hanging Clip bolted to plenum shell
Hanging Clip
SUPPLY PLENUM SHELL
NOTE
Model GGH2O
Option #3
Threaded Rod
supplied by others
9
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