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Non-Welded Double Wall Grease Duct Systems
Installation, Operation, and Maintenance Manual
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A0018672
August 2013 Rev.9
TABLE OF CONTENTS
WARRANTY 3
LISTINGS 4
CLASSIFICATIONS 4
APPLICATION 4
CLEARANCES 5
MECHANICAL 6
Joint Sealant 6
Sealant Features 6
Table 2—Sealant Usage Chart 6
Grease Duct Joint Assembly 7
Adjustable Duct&Transition Connection 8
Adjustable Duct Standard Installation 9
Risers—Factory&Field (Bolted) Risers 11
Duct Drains 12
Manifold Tee 12
Access Door(Tee Cap)Assembly 13
Fan Adapter Plate 14
Prevention of Grease Accumulation in Horizontal Grease Duct 14
Alignment&Bracing of Grease Duct 14
Horizontal Support&Support Spacing 14
Vertical Support&Vertical Support Spacing 16
Through Penetration& Fire Stops 21
Annular Distance 21
Floor&Ceiling Fire Stop Installation 22
Wall Fire Stop Installation 23
Grease Duct Assembly Examples 24
METHODS USED TO TEST DUCT AFTER ASSEMBLY 27
Method 1 —Light Test per IMC 506.3.3.1 27
Method 2—Smoke Test 27
GENERAL DUCT WEIGHTS 27
Weight—DW-2R 27
Weight—DW-3R 27
Weight—DW-3Z 27
Weight—Example 27
CLEANING & MAINTENANCE RECORD 28
2
WARRANTY
This ductwork system is warranted to be free from defects in material and workmanship, under normal use
and service,for a period of 12 months from the date of shipment. This warranty shall not apply if:
1. The equipment is not installed by a qualified installer per the MANUFACTURER'S installation
instructions shipped with this product (this guide should be kept with the equipment once installation
is complete),
2. The equipment is not installed in accordance with federal, state and local codes and regulations.
3. The equipment is misused or neglected.
4. The equipment is not operated within its published capacity.
5. The invoice is not paid within the terms of the sales agreement.
The MANUFACTURER shall not be liable for incidental and consequential losses and damages potentially
attributable to malfunctioning equipment. Should any part of the equipment prove to be defective in material
or workmanship within the 12-month warranty period, upon examination by the MANUFACTURER, such
parts will be repaired or replaced by the MANUFACTURER at no charge. The BUYER shall pay all labor
costs incurred in connection with such repair or replacement. Equipment shall not be returned without
MANUFACTURER'S prior authorization and all returned equipment shall be shipped by the BUYER, freight
prepaid to a destination determined by the MANUFACTURER.
3
LISTINGS
This grease duct has been tested and is listed to UL1978 and UL2221 and testing has been extended to
recognize ASTM E2336 and AC101 due to similar testing criteria. Models 2R, 3R and 3Z are used for
grease duct applications when installed in accordance with these instructions and National Fire Protection
Association "NFPA 96"; Standard for Ventilation Control and Fire Protection of Commercial Cooking
Operations.
CLASSIFICATIONS
UL 2221: Standard for Fire Resistive Grease Duct Enclosure Assemblies. Chapter 7 of this standard
references a test labeled Internal Fire Test. Section 7.1.1 references two installation conditions, Condition A
and Condition B. Condition A represents all installation conditions except for installation within non-ventilated
combustible enclosures. Condition B represents installation within a non-ventilated combustible enclosure.
Model 3Z is classified under UL2221 (Test of Fire Resistive Duct Enclosure Assemblies)as an alternate to 2-
Hr. fire resistive shaft enclosures with a minimum zero clearance to combustibles (sizes 8"to 24" diameter).
Model 3Z is listed in accordance with the requirements for duct enclosure Condition A and B.
Model 3R is classified under UL2221 (Test of Fire Resistive Duct Enclosure Assemblies)as an alternate to 2-
Hr.fire resistive shaft enclosures with a reduced clearance to combustibles(sizes 8"to 24"diameter). Model
3R is listed in accordance with the requirements for duct enclosure Condition B.
Model 2R is classified under UL2221 (Test of Fire Resistive Duct Enclosure Assemblies)as an alternate to 2-
Hr.fire resistive shaft enclosures with a reduced clearance to combustibles(sizes 8"to 16"diameter). Model
2R is listed in accordance with the requirements for duct enclosure Condition B.
APPLICATION
Double wall grease ducts are listed for a continuous internal temperature of 500°F and intermittent
temperatures of 2000F. Double wall grease duct is ideally suited for use in commercial cooking installations
for the removal of smoke and grease laden vapors. Grease duct system size and capacity information may
be obtained from the ASHRAE Handbook— Fundamentals or from the Air Pollution Engineering Manual of
the US Fnvirnnmental Protection Agency.Grease duct installationsfor cleaning interior
urequire provisions I.ICd111111J. the II ILGIIUr
of the duct. NFPA 96 cleanout requirements are as follows:
1. A cleanout must be provided at each change of direction, except where the entire length of duct can
be inspected and cleaned from either the hood or the discharge end.
2. On horizontal duct runs, at least one(1)20"diameter opening must be provided. Where the opening
is smaller than 20"diameter, openings large enough to permit cleaning must be provided at intervals
of no more than 12'.
3. Openings must be at the side or the top, whichever is more accessible. When the opening is on the
side of the duct, the lower edge of the opening must be at least 1 1/2" above the bottom of the duct.
For the listed grease duct, this is accomplished by the use of the grease manifold tee and cleanout
cap.
4. On vertical duct runs where personnel entry is possible, access must be from the top of the riser.
Where entry is not possible, access must be provided at each floor.
NOTE: ACCESS REQUIREMENTS ARE SUBJECT TO CHANGE IN ACCORDANCE WITH LOCAL CODE.
LOCAL AUTHORITIES SHOULD BE CONSULTED FOR EXACT REQUIREMENTS. GREASE DUCT MAY
BE CONNECTED ONLY TO HOODS IN A SINGLE FIRE ZONE ON ONE FLOOR. DO NOT CONNECT
GREASE DUCTS TO ANY OTHER PART OF THE BUILDING VENTILATION OR EXHAUST SYSTEM.
4
When grease duct is installed in accordance with these installation instructions and the joints are sealed
properly with the recommended sealant, the system will contain a grease fire within the duct. A grease fire
can burn at extremely high temperatures. This system should be dismantled and inspected after any
exposure to a grease fire. Any section that is distorted or discolored should be replaced. All joints in the
system should be examined. The sealant expands to ensure a positive seal in the case of a fire, and any
sealant that has been exposed to high temperature must be replaced. This will ensure that the system
maintains its integrity against fire conditions in the future. The manufacturer of this grease duct cannot be
responsible for grease duct systems that are not properly maintained or have been subjected to one or more
grease fires.
CLEARANCES
In all buildings more than one story in height and in buildings where the roof-ceiling assembly is required to
have a fire resistance rating,the duct must be enclosed in a continuous enclosure from the lowest fire-rated
ceiling or floor above the hood,through any concealed spaces,to or through the roof to maintain the integrity
of the fire separations required by the applicable building code provisions. If the building is less than 4
stories in height,the enclosure shall have a fire resistance rating of not less than 1 hour. If the building is 4
stories or more in height,the enclosure shall have a fire resistance rating of not less than 2 hours. Single
wall grease duct is primarily intended for use in non-combustible surroundings. When installed in an open
room where enclosure is not required, double wall grease duct may be located at clearance to combustibles
in accordance with Table 1.
Table 1 —Grease Duct Clearances
DUCT INNER DIAMETER OUTSIDE CLEARANCE TO CLEARANCE TO
MODEL (ID) DIAMETER COMBUSTIBLES NON-COMBUSTIBLES
DW 8"-24" = ID 18" 0"
DW-2R 8"- 16" ID+4 3/4"* 0"
DW-3R 8"-24" ID +6 3/4"** 0"
DW-3Z 8"-24" ID+6 0" 0"
The above figures represent air space, in inches to surrounding.
NOTE:See NFPA 96, 2004 EDITION, Chapter 3,Definition of Combustible, Limited Combustible and Non-Combustible.
*DW—2R:3/4"clearance to combustibles from the surface of the duct outer shell;zero inch clearance from
combustibles from the tip of the outer V Band.
** 3 ,
DW—3R.: /4'clearance to combustibles from the surface of the duct outer shell;zero inch clearance from
combustibles from the tip of the outer V Band.
NOTE: Double wall duct systems with reduced clearance"R" have been tested using Condition B—installed
within non-ventilated combustible enclosure. See Fig. 1 below for representation of reduced clearance note,
the V Band may be in contact with a combustible surface. 1
Fig.1 — Reduced Clearance
I 314"REDUCED
—'l CLEARANCE
41 „ ,
jj
. umt ;:,,
Mk /' COMBUSTIBLE
SURFACE.
DOUBLE
V BAND
DUCT
5
MECHANICAL
Joint Sealant
The joint sealant used to seal all joint assemblies is a 3M product. 3M Fire Barrier 2000+ Silicone Sealant is
a ready-to-use, gun-grade, one-component silicone elastomer that cures upon exposure to atmospheric
humidity to form a flexible seal. 3M Fire Barrier 2000+ Silicone Sealant, when installed properly, will control
the spread of fire before, during and after exposure to open flames. It will stop the spread of noxious gas,
smoke and water, and maintain the integrity of fire rated assemblies and construction. All grease ducts must
be liquid tight per NFPA 96. The following steps are to be used to ensure that this requirement is met.
NO SEALANT SUBSTITUTES MAY BE USED.
Sealant Features
1. Superior adhesion.
2. Capable of withstanding 2000F+temperatures.
3. Class 25 sealant, per ASTM 920.
4. Re-enterable/repairable.
5. Provides up to 4-hours fire-rating.
6. Cures upon exposure to atmospheric humidity.
7. Working time 30 minutes.
8. Cure time 14 to 21 days.
9. Applied with a standard caulk gun.
Table 2—Sealant Usage Chart
3M FIRE BARRIER 2000 PLUS USAGE
DIAMETER DUCT PERIMETER FT AVERAGE FEET NUMBER OF
PER TUBE JOINTS PER TUBE
8" 2.16 30 7
10" 2.68 30 6
12" 3.21 30 5
14" 3.73 30 4
16" 4.25 30 3.5
18" 4.78 30 3
20" 5.30 30 3
24" 6.35 30 2.5
6
Grease Duct Joint Assembly
All grease ducts are to be liquid tight per NFPA 96. The following steps are to be used to ensure that this
requirement is met.
1. Fill the V band used with inner ductwork with 3M Fire Barrier 2000+Silicone. The bead should be
continuous. See Table 2,for the number of joints per tube.
2. Place the loose V band over the duct flange. Apply a continuous bead of 2000+ Silicone 1/4"wide to
the flange that will be joined.
3. Join the two flanged ends of the inner duct sections together and rotate slightly to ensure complete
coverage of sealant on flanges.
4. For horizontal duct runs,the"V"clamp hardware should be located on the top side of the duct and be
orientated between the 3 and 9 o'clock position on the duct.
5. NEVER install the "V" clamp with the hardware orientated on the bottom side of the duct on
horizontal runs.
6. Install the V band around the duct flanges making sure the flanges are located within the V band.
Tap the outside of the V band while tightening V band hardware to make sure the flanges are aligned
and have been pulled together. Secure the'/-20 hardware to 85 in-lbs.
7. Insulation must be minimum of 4'/2'wide, and the same type and number of layers as the base duct.
Tightly pack and completely fill all voids between the inner duct and the outer shell.
8. Install the double V band ensuring the outer shell flanges are positively engaged in the V bands
before tightening the'/4-20 hardware to 85 in-lbs. The double V band can be sealed using 3M Fire
Barrier 2000+Silicone when being installed outside.
Fig. 2—Joint Assembly
STEP 1 STEP 2 STEP 3
` DETAIL A
STEP 4 STEP 5
STEP 6
IMPORTANT: THE HARDWARE USED TO ASSEMBLE THIS DUCTWORK IS SPECIFICALLY
DESIGNED FOR THIS APPLICATION. NO SUBSTITUTE HARDWARE IS ALLOWED. ALL
REPLACEMENT HARDWARE MUST BE PURCHASED FROM THE FACTORY.
7
Adjustable Duct & Transition Connection
Adjustable duct sections may be used in conjunction with transition plates when they terminate at the fan.
The adjustable duct section is fully welded to the transition plate, and then connected to the standard duct
length using non-welded connections. Double wall adjustable duct sections are assembled in the field, as
the exact length needed for the application is not known. Components for outer shell and insulation ship
loose. Once fully assembled,the transition plate is secured to the curb using the method referenced in Fig.
8—Fan Adapter Plate.
1. The standard duct section in the adjustable assembly is installed using the standard connection
method, (see Fig.2). Note:this is the piece with two flanges and the outer shell collar already
attached 1 1/Z"from the duct flange.
2. Adjustable duct assemblies that are used with transition plates only have one inner duct flange
protruding from the outer duct shell.This is the side that connects to the standard length duct.
3. The adjustable collar is slipped on to the adjustable duct section. Make sure the adjustable collar
flanges are opposite the adjustable duct section flange.
4. The adjustable section is pushed inside the standard duct section. Make sure the minimum overlap is
set correctly; see Table 3.
5. Once the overlap is set correctly, silicone the flanges of the bottom duct section and the adjustable
collar using connection method referenced in Fig.2—Joint Assembly step 1 through step 3.
6. Adjustable collars are sealed to the adjustable duct using 3M Fire Barrier 2000+Silicone. Once the V
band has been installed,tighten the adjustable collar hardware to 85 in-lbs.
7. The insulation provided is used to wrap the adjustable assembly. Ensure all voids are adequately
filled.
8. Cut the outer shell cover to the length and then install using the provided sheet metal screws. Make
sure the shell cover overlaps and are secured to the shell collars. Use only hardware provided as
longer screws may penetrate inner duct.
9. 3M Fire Barrier 2000+ Silicone may be used to seal the outer shell.
Fig. 3—Adjustable Duct & Transition Plate
STEP 1 TRANSITION STEP 2
STEP 3
PLATE.
UTER SHELL TIGHTEN
COLLAR.
3M FIRE BARRIER 851N-LBS.
2000 P 1.0 S.
ADJUSTABLE
iiiis)
DUCT.
ADJUSTABLE �If•+
COLLAR. TIGHTEN •''
851N IBS.
3M FIRE BARRIER
2000 PLUS.
V BAND.
TANDARD OUTER SHELL
3M FIRE BARRIER
DUCT 2000 PLUS. COLLAR.
TRANSITION
STEP4 STEP5 STEP6
CURB.
INSULATION. ,
INSULATION. ••UTER SHELL
SHEET METAL COVER.
SCREWS.
8.
Adjustable Duct Standard Installation
Adjustable duct lengths are used to make up variable lengths in the duct system(s). Adjustable sections
should always be installed with the overlap to the inside of the standard duct section. Overlap should
always be opposite the direction of airflow. This will allow grease/water to run back to the hood when the
system is shut down. If the inner adjustable section is too long to fit into the adjacent section of duct
without interfering with the flow path it should be trimmed to the desired flange to flange length. Flange to
flange length of adjustment can range from 4"to 26".
1. The standard duct section in the adjustable assembly is installed using the standard connection method,
(see Fig.2). Note:this is the piece with two flanges and the outer shell collar already attached 1 1/2"from
the duct flange.
2. The adjustable collar is slipped on to the adjustable duct section. Make sure the adjustable collar flanges
are opposite the adjustable duct section flange.
3. The adjustable section is pushed inside the standard duct section. Make sure the minimum overlap is
set correctly see Table 3.
4. Once the overlap is set correctly, silicone the flanges of the bottom duct section and the adjustable collar
using connection method referenced in Fig.2—Joint Assembly step 1 through step 3.
5. Adjustable collars are sealed to the adjustable duct using 3M Fire Barrier 2000+Silicone. Once the V
band has been installed,tighten the adjustable collar hardware to 85 in-lbs.
6. The insulation provided is used to wrap the adjustable assembly. Ensure all voids are adequately filled.
7. Cut the outer shell cover to the length and then install using the provided sheet metal screws. Make sure
the shell cover overlaps and are secured to the shell collars. Use only hardware provided as longer
screws may penetrate inner duct.
8. 3M Fire Barrier 2000+Silicone may be used to seal the outer shell.
Table 3—Minimum Overlap
DIAMETER MIN OVERLAP FOR
ADJUSTABLE
DUCT
8" 4."
10" 5"
12" 6"
14" 6"
16" 6"
18" 6"
20" 6"
24" 6"
9
Fig. 3a-Adjustable Duct Overlap
INSTALLED LENGTH
MIN.SEE TABLE 3. F-
I'Mil
i l AIRFLOW DIRECTION
iI
ill
i IM
OUTER SHELL ADJUSTABLE
COLLAR. V BAND. SECTION.
DUCT SECTION. ADJUSTABLE
COLLAR.
Fig. 3b-Collar& Adjustable Duct Installation
STEP 1 STEP 2 STEP 3
3M FIRE BARRIER
2000 PLUS. ADJUSTABLE X001 BARRIER
DUCT.
iii
ADJUSTABLE
COLLAR.
3M
TIGHTEN
85 INdBS.
STANDARD TIGHTEN
DUCT. 85 IN-LEIS
STEP 4 STEP 5
INSULATION.
OUTER SHELL
COVER.
SHEET METAL
SCREWS.
INSULATION.
10
Risers — Factory & Field (Bolted) Risers
There are two options for the riser(connection to the hood plenum); factory welded and field bolted. Factory
installed risers are welded to the plenum per instructions that detail riser size and location. The instruction
below covers field installed (bolted) riser(s). When field installed riser(s) are requested, they ship loose
allowing the installer to decide on the location. Field installed riser(s)are preferred when the exact location is
not known or when adjustments need to be made for misalignment in duct systems.
1. Locate the specific position at which the riser needs to be installed.
2. Use the riser as a guide when marking the hood. Note: Make sure the hole location is inside the
plenum area before cutting any holes.
3. Since the riser is going to be bolted to the plenum, a bolt hole circle will need to be cut. Use the
bottom or loose retaining ring as a template.Align the inner circles of the hole in the plenum with the
retaining ring and mark the bolt hole circle. Make sure the bolt hole circle is inside the plenum area
before cutting.
4. Use the 3M Fire Barrier 2000+Silicone to seal around the riser hole. Apply sealant to the top and
bottom of the hole. Make sure the silicone bead is a minimum of thick and is continuous inside
and outside of the bolt hole circle.
5. Center the riser over the hole in the plenum and push down. Make sure the riser flange is positively
sealed.Also, make sure the captured retaining ring on the riser is pushed down into the sealant.
Sealant should come through the holes on the ring.
6. Align the loose retaining ring with the hole on the inside of the plenum. Push the ring up into the
sealant.Align the holes in the bottom and top retaining rings and secure using'A-20 hardware.
7. Place the loose duct flange ring over the riser before installing the connecting duct section using
connection method (see Fig. 2—Joint Assembly, step 1 through step 3).
8. Once the riser and connecting duct section(s) have been connected, install the insulation provided.
Make sure all voids are filled.
9. Install the riser covers by pushing the two halves together around the duct flange ring and securing it
using sheet metal screws provided. Use only hardware provided, as longer screws may penetrate
the inner duct.
10. See Fig. 2—Joint Assembly, step 1 through step 3,to install standard duct sections to factory
installed or welded risers.
11. The slots in the riser covers provide an opening for the installation of duct sensors if required.
Fig. 4— Field Installed Riser—Bolted
STEP 1 STEP 2
3M FIRE BARRIER RISER.
2000 PLUS. DOUBLE WALL
DUCT.
V BAND.
_' DUCT
FLANGE
RING
HOOD TOP_
RETAINING
RINGS. • • ' 1/420 HARDWARE.
V BAND. STEP 4
RISER COVER. STEP 5
HOLE FOR
41111111W DUCT STAT
INSTALLED
HERE.
4111
INSULATION.
SHEET METAL
RISER COVER. SCREWS.
11
Fig. 5— Duct Drain
Duct Drains
Drains are used to provide a point at which low DUCT SECTION.
points in the duct system can be drained.
Condensation and low lying water left over from duct DOUBLE V TEE.
Et
cleaning can be drained easily with the installation of AND.
the ball valve drain. Drains are designed to aid in ADAPTER.
duct cleaning and can be used to drain grease into
an approved grease collection reservoir. Drains can
be hard piped to an approved grease collection
reservoir, remove the cap and connect to the 1-1/2"
NPT threads(see Fig.5.for details).
ADAPTER.
Manifold Tee DRAIN.
The manifold tee is used to provide access for
cleanout to comply with NFPA 96 requirements. It is equipped with an internal blank that acts as a grease
dam and gasket. The access port is then closed with a cleanout cap or tee cap. The tee cap is then covered
with layers of insulation that is covered in an outer shell called the access door collar. The location of the
access port in the tee is dependent on the orientation of the tee in the final installation. The access port
location in the manifold tee can be orientated as required (see Fig. 6). Access ports should never be located
where grease can build up and fall out once the cleanout cap is removed or where the access door collar
cannot be removed to gain access to the inner duct.
Fig. 6 - Manifold Tee Position
OUTER DUCT INNER DUCT
SHELL. TEE.
MIIE 1
m
111
I II T
rr-
ACCESS DOOR ACCESS DOOR
RIGHT. LEFT.
ACCESS DOOR
TOP. INSULATION.
GREASE DAM.
_ I lot.(1,10141011101)
• ACCESS DOOR
REMOVED FOR
CLARITY.
12
Access Door (Tee Cap) Assembly
Access doors(tee caps)are available in diameters from 8"to 24". They work in conjunction with the manifold
tee as previously shown in Fig. 6. The tee joint connection is shown in Fig. 2 — JOINT ASSEMBLY;
however, the installation of the access door is slightly different so read the following instructions very
carefully. Consult NFPA 96, Chapter 7, Section 7.3.1 "Openings shall be provided at the sides or at the top
of the duct, whichever is more accessible, and at change of directions."
1. Select the location and the position of the access door.
2. All tee joints will be connected as shown in Fig.2—JOINT ASSEMBLY except for the access door.
3. Apply a '/4' continuous bead of 3M Fire Barrier 2000+ silicone to the flange of the tee that will be
used for access to the duct system.
4. Center the inside blank (grease dam)over the opening of the tee and apply pressure. Make sure the
grease dam is sealed to the tee flanges.
5. Apply enough pressure to create a positive bond between the tee flange and the grease dam.
Remove excess sealant after making parts concentric(centered).
6. Sealant will begin to cure upon exposure to atmospheric humidity. It will form a flexible seal.
7. Once the sealant is dry attach the access door using a V band. Ensure flanges are in the V before
tightening '/4-20 hardware to 85 in-lbs.
8. Once the inner access door assembly is complete install the outer access door or access door collar.
9. The outer access door collar is used to seal the inner access door with insulation, (see Fig. 7 below).
Fig. 7-Access Door Assembly
INNERD UCT
TEE.
ACCESS DOOR
INSULATION. COLLAR V BAND.
OUTER DUCT e
SHELL.
LAYERS
ACCESS DOOR
INSULATION.
, OUTER ACCESS
INNER DOOR V BAND.
V BAND. 4111
a
GREASE
DAM.
INNER
ACCESS
DOOR.
ACCESS DOOR
COLLAR.
O UT ER
ACCES S
DOOR.
13
Fan Adapter Plate Fig. 8—Fan Adapter Plate
The fan adapter plate(Transition Plate)is designed to connect
to a roof curb. The duct section is welded to the underside of
the adapter plate. The adapter plate is formed to provide a EXHAUST FAH.
slope to allow grease deposits to flow back towards the duct.
When connected (see Fig.8),the plate mounts on top of the fan TRANSITION
PLATE.
curb that supports the fan housing. The plate may be positioned CERAMIC
off center within the curb provided that the minimum distance to GASKET.
ED
combustibles is maintained. In the event that the plate is CEUNRB.
positioned off center, trim off excess plate material to allow for
fan placement. Secure the plate to the curb using a minimum of
three fasteners per side. A suitably sized fastener provided by VERTICAL
others is used. The fan adapter plate can be used to maintain ADJUSTABLE SUPPORT.
distance to combustibles and also for vertical support. See Fig. DUCT secraH.
3 for adjustable duct section assembly. The top collar is
installed upside down to seal the insulation at the fan
termination/transition plate.
Prevention of Grease Accumulation in Horizontal Grease Duct
In some areas the local code authority may insist on inclusion of 1/4" per foot slope. In such cases, a short
"Slope Transition" section is available from the factory. For correct installation, two slope transitions are
generally required - one at the beginning and end of the horizontal duct run. For installations with horizontal
runs greater than 75 feet, some local codes demand a 1" per foot slope. Consult with local code authorities if
unsure about local requirements. Offset collars have been designed to meet the above specification. The
collar is used in conjunction with other accessories such as tee's and elbows to maintain the above listed
slope in horizontal duct runs. The"V" clamp hardware should be located on the top side of the duct and be
orientated between the 3 and 9 o'clock position on the duct. Never install the "V" clamp with the hardware
orientated on the bottom side of the duct on horizontal runs.
Alignment & Bracing of Grease Duct
Grease duct has the characteristics of a continuous stainless steel pipe and it will expand and contract along
its entire length with changes in temperature. For this reason, conventional methods of attaching guides and
braces to the outer wall of the grease duct cannot be used. Correctly installed support rings, saddles and
wall guide assemblies will serve to keep the duct aligned, provide for adequate resistance to lateral loads
and allow the free axial expansion and contraction movement. A simplified rule for duct expansion is that the
axial growth will be approximately 1 inch per 100 feet of pipe length for each 100 degrees Fahrenheit the
exhaust vapor temperature is above the surrounding air temperature.
Horizontal Support & Support Spacing Table 4— Horizontal Support Spacing
Horizontal duct runs are supported using 2 X 2 X 1/8" angle,
Uni-strut and or Uni-strut / saddle combination. Horizontal DIAMETER HORIZONTAL
support spacing is shown in Table 4. When cutting the angle or SUPPORT SPACING
Uni-strut to length,there must be a minimum of 2"on either side (FEET)
of the duct shell to allow for rod attachment. Once the angle
8" 7'
has been cut to length it is suspended using 1/2" threaded rod
(minimum). Appropriate sized holes are drilled / punched in 10" 7'
either end of the angle. The 1/2"threaded rod is secured to the 12" 7'
angle or Uni-strut using ''/z" grade 5 hex nuts and 1/i' hardened 14" 7'
washers, see Fig. 9. Note:double hex nuts are used as locking 16„ 7'
nuts to make sure hardware does not come loose over time.
18" 5'
20" 5'
24" 5'
14
Fig. 9-Horizontal Support Details
IMPORTANT: VERTICAL & HORIZONTAL SUPPORTS SHOWN IN THIS MANUAL ARE
RECOMMENDED. SUPPORTS BY OTHERS MUST BE APPROVED BY THE MANUFACTURER AND
AHJ. SUPPORT SPACING MUST BE AS STATED IN THIS MANUAL.
1/7 THREADED DUCT SECTION.
RODS.
CENTER DOUBLE V BAND.
DUCT
0 ONO
1101 11111111111111
I IIIIIII
`ile
US DUCTad UNI STRUT. I _ SEE TABLE 4
UNI STRUT-BOTTOM CONNECTION
CENTER
DUCT
1/2"THREADED 117 THREADED
RODS RODS.
a"HARDENED
UNI STRUT. WASHERS 2 PLC'Si(.
SADDLE.
?HEX NUTS
ORADEfi,4PLCS. UNI STRUT. `
Iri
L ....,..,
I.., DUCT DIA. I
PLUS 4" ���777
SADDLE-TOP CONNECTION SADDLE-BOTTOM CONNECTION
1/2"THREADED 1/2"HEX NUTS 1/2"THREADED I
RODS. GRADE 5.2 PLC'S. RODS. SADDLE
(BOTTOM)
1/2"HARDENED
0 WASHERS 2 PLC'S.
le WASHERS
HARDENED
WASHERS 2 PLC'S.
Ill
SADDLE.
I
(TOP) VIIUNI STRUT1/2"HEX NUTS
I GRADE 5,4 PLC'S.
15
Vertical Support &Vertical Support Spacing
This duct system requires supports along vertical runs. The vertical support(DWXXDWVESU)assembly kit
consist of (2) wall support plates, (2) side support plates, (2) flat support plates (specific to shell diameter)
and hardware. There are three different types of hardware supplied depending on the type of wall that the
duct is being supported. There are three types of wall construction listed below; gypsum with wooden studs,
gypsum with 25 gauge steel studs and concrete/masonry. Each wall construction type requires different
hardware to be used when installing the wall support and side support plate. Maximum vertical support
spacing is shown in Table 5. Do not exceed this listed vertical spacing.
Table 5—Vertical Support Spacing
DIAMETER VERTICAL SUPPORT SPACING(FEET)
8" 10'
10" 10'
12" 10'
14" 10'
16" 10'
18" 10'
20" 10'
24" 10'
Fig. 10—Vertical Support Kit
IMPORTANT: VERTICAL & HORIZONTAL SUPPORTS SHOWN IN THIS MANUAL ARE
RECOMMENDED. SUPPORTS BY OTHERS MUST BE APPROVED BY THE MANUFACTURER AND
AHJ. SUPPORT SPACING MUST BE AS STATED IN THIS MANUAL.
WALL SUPPORT PLATE.
FLAT SUPPORT PLATE.
5116-18 WHIZ NUTS&BOLTS
USED TO SECURE TO TOP
PLATE TO THE SIDE PLATE.
41/4
5116-18 X 1'SELF DRILUNO
SCREWS USED TO SECURE
DOUBLE WALL DUCT SHELL.
` :IDE SUPPORT PLATE.
WALL SUPPORT PLATE.
16
Fig. 10a—Vertical Support Details
DUCT
SYSTEM.
DU CT VERTICAL SUPPORTS 'OUBLE WALL MATERIAL
II
HAVE SPECIFIC INSTALLATION V BAND. SEE INSTALLATION
INSTRUCTIONS PER THE TYPE AM INSTRUCTIONS PER
OF WALL CONSTRUCTION,SEECONSTRUCTION TYPE.
SPECIFIC DETAIL BELOW. = DOUBLE I
TYPES OF WALL :.; RTICAL V SAND.
CONSTRUCTION: SUPPORT. i
2 X 4 WOODEN STUDS. .
2 X 4(25)GAUGE STUDS. .___
CONCRETE/MASONRY. 0 UC T SYSTEM.
was
in T 11
SEE TABLE 5
DUCT SYSTEM.
V BAND INSTALLED
ABOVE THE
TOP PLATE.
NMI HORIZONTAL.
SUPPORT.
I..,,AA*....... CBUNG. VERTICAL _-
SUPPORT.
•it• RTIC AL _
SUPPORT. II
5/1618XT I.. 1 o Il�� Ili/
SELF DRILLING _ 6 WHIZ NUTS 1
SCREWS. &BOLTS USED TO •
SECURE TOP PLATE.
ke__SEE TABLE4
17
Vertical Support For Wooden Wall Construction
1. Wall must be constructed of 2 x 4 wooden studs with a max spacing of 24 inches on center and
covered with 5/8 inch gypsum.
2. Install the top wall support plate so that the flat supports plates,when installed,will be under the duct
v-band. See Fig 10a for details.
3. The wall support plate has specific holes that locate the side plates so that when installed,they
match the duct outer shell diameter. Measure the duct diameter and then measure from the wall
plate center holes the radius to locate the first side plate. Example: if the duct being installed has a
30 inch outside shell, measure from the center of the wall plate 15 inches. This will locate the inside
of the side plate on the wall plate. Side support plate mounting holes should be on the outside.
4. Once the first wall support plate is located,secure to the wall using the 5/16 x 4 inch toggle bolts and
washers. Use the 7/8 inch holes that are 24 inches on center from the side plate mounting holes. In
some cases, mounting holes may have to be drilled to align with studs.
5. Follow the instructions above and mount the second wall support plate. Measurement will be 44
inches from the top of the first wall support to the bottom of the second wall support.
6. Install the side support plates. Measure from center and locate the first plate. One of the side plates
must be installed using 5/16 x 3 Y2 inch lag bolts and washers directly into the 2 x 4 wooden stud. Fill
all holes using the lag bolts and washer that line up with the stud. Lag bolts will secure the wall
plates and side plates to the studs.
7. Measure 24 inches from the first stud that the side plate is secured to and install 5/16 x 3'/2 inch lag
bolts and washers.This will secure the wall support plate to the stud 24 inches on center.
8. Measure from center and install the second side plate. This plate may fall between studs and if so,
secure using the 5/16 x 4 inch toggle bolts and washers.
9. Repeat the above process so that both wall supports and side plates are installed and secure.
10. Install the rear flat supportplate using5/16 nuts and bolts. Mount the duct so the v band is above
PP
the flat support plate and secure by installing the front flat support plate.
11. The v band"V"should be sitting on top of the flat plate.A cut out is provided in the flat plate to allow
the v band bracket to fall through so the"V"is flush with the flat support plate
12. Secure the side support left and right plates to the outer duct shell using the 5/16-18 x 1 inch self
drilling screws. Use the guide holes to locate the shell center and fill all holes center, center left and
center right. A minimum of 18 screws must be used on each side of the duct.
Figure 10B—Wooden Stud Wall Vertical Support
GYPSUM.
X4 WOODED
24.000 STUDS.
ALL SUPPORT PLATE
/__1//__n -ieRxi.LwiIz6ALL SUPPORT PLATE.
NUTS TS.
LAT SUPPORT
PLATE y
LAT SUPPORT PLATE
• SIDE SUPPORT PLATE.
IDE SUPPORT PLATE-MUST BE INSTALLED
USING 5/16 X P TODDLE BOLTS R WASHERS
44.000 WHEN INSTALLED OVER OPEN CAVITIES.
IDE SUPPORT PLATE•MIMBAUM OF ONE
SIDE PLATE MUST BE INSTALLED DIRECTLY
INTO ASTUD USING LAG BOLTS 8 WASHERS.
ALL SUPPORT PLATE-MUST BE INSTALLED
• USING 5/115 X 3 117 LAO BOLTS d WASHERS
DIRECTLY INTO THE 2X 4 STUDS.
A8-18 X1'SELF
DRILLING SCREWS.
6X 4'TOGGLE
BOLTS&WASHERS..
8-18 X 31/7 LAD BOLTS
8 WASHERS INSTALLED DIRECTLY
INTO THE 2 X 4 STUDS.
18
Vertical Support For 25 Gauge Steel Stud Wall Construction
1. Wall must be constructed of 2 x 4 25 gauge (minimum)steel studs with a max spacing of 24 inches
on center and covered with 5/8 inch gypsum.
2. Install the top wall support plate so that the flat supports plates,when installed,will be under the duct
v-band. See Fig 10a for details.
3. The wall support plate has specific holes that locate the side plates so that when installed,they
match the duct outer shell diameter. Measure the duct diameter and then measure from the wall
plate center holes the radius to locate the first side plate. Example: if the duct being installed has a
30 inch outside shell, measure from the center of the wall plate 15 inches. This will locate the inside
of the side plate on the wall plate. Side support plate mounting holes should be on the outside.
4. Once the first wall support plate is located, secure to the wall using the 5/16 x 4 inch toggle bolts and
washers. Use the 7/8 inch holes that are 24 inches on center from the side plate mounting holes. In
some cases, mounting holes may have to be drilled to align with studs.
5. Follow the instructions above and mount the second wall support plate. Measurement will be 44
inches from the top of the first wall support to the bottom of the second wall support.
6. Install the side support plates. Measure from center and locate the first plate. One of the side plates
must be installed using 5/16 x 1 1/2 self drilling screws and washers directly into the 2 x 4 metal studs.
Fill all holes using the self drilling screws and washer that line up with the stud. Self drilling screws
will secure the wall plates and side plates to the studs.
7. Measure 24 inches from the first stud that the side plate is secured to and install 5/16 x 1 1/2 inch self
drilling screws and washers.This will secure the wall support plate to the stud 24 inches on center.
8. Measure from center and install the second side plate. This plate may fall between studs and if so,
secure using the 5/16 x 4 inch toggle bolts and washers.
9. Repeat the above process so that both wall supports and side plates are installed and secure.
10. Install the rear flat support plate using 5/16 nuts and bolts. Mount the duct so the v band is above
the flat support plate and secure by installing the front flat support plate.
11. The v band"V"should be sitting on top of the flat plate.A cut out is provided in the flat plate to allow
the v band bracket to fall through so the"V" is flush with the flat support plate
12. Secure the side support left and right plates to the outer duct shell using the 5/16-18 x 1 inch self
drilling screws. Use the guide holes to locate the shell center and fill all holes center, center left and
center right. A minimum of 18 screws must be used on each side of the duct.
Figure 10C—Steel Stud Wall Vertical Support
GYPSUM.
24 OOp sT uos
X♦ GAU.GE
ALL SUPPORT PLATE.
FLAT SUPPORT SUPPORT PLATE.
PLATE.
LAT SUPPORT PLATE
61B X rWHE
NUR$&BOLTS.
44 000 DE SUPPORT PLATE
IDE SUPPORT PLATE•MUST BE NSTALLEO
USING 5111 X f TOGGLE BOLTS&WASHERS
WHEN INSTALLED OVER OPEN CANTLES OR
26 GAUGE STEEL STUDS.
SIDE SUPPORT PLATE.MMMUM OF ONE
SIDE PLATE MUST BE NSTALLED DIRECTLY
INTO A STUD USING SELF DRILLING SCREWS
&WASTERS.
SIDE SUPPORT SUPPORT P LATE•MIST BE INSTALLED
PLATE. USNO MA X I I/2'SELF DRILLING SCREWS
&Y114SI S DIRECTLYMO THE 2 X 4 QS)
/616 X 1"SELF GAUGE STEEL STUDS.
DRILLING SCREWS.
B X4'TOGGLE
BOLTS&WASHERS..
S%11A"SELF OPo WNG SCREWS
RECTLY
MO HERS GEUES X4QS) MJOSTEEL STIRS.
19
Vertical Support For Concrete/Masonry Wall Construction
1. These steps describe the method to attach the vertical support to a concrete and (or)masonry wall.
2. Install the top wall support plate so that the flat supports plates, when installed,will be under the duct
v-band. See Fig 10a for details.
3. The wall support plate has specific holes that locate the side plates so that when installed,they
match the duct outer shell diameter. Measure the duct diameter and then measure from the wall
plate center holes the radius to locate the first side plate. Example: if the duct being installed has a
30 inch outside shell, measure from the center of the wall plate 15 inches. This will locate the inside
of the side plate on the wall plate. Side support plate mounting holes should be on the outside.
4. Once the first wall support plate is located,secure to the wall using the 5/16 x 2 1/4 inch
concrete/masonry screws and washers. Use the 7/8 inch holes that are 24 inches on center from the
side plate mounting holes. Install 5/16 x 2 1/4 inch concrete/masonry screws in each end of the wall
support plate. In some cases, mounting holes may need to be drilled.
5. Follow the instructions above and mount the second wall support plate. Measurement will be 44
inches from the top of the first wall support to the bottom of the second wall support.
6. Install the side support plates. Measure from center and locate the first plate. Fill all holes using the
5/16 x 2 1/4 inch concrete/masonry screws and washer. Concrete/masonry screws will secure the
wall plates and side plates to the wall.
7. Measure 24 inches from the first set of holes in the side plate that is secured to the wall and install
5/16 x 2 1/4 inch concrete/masonry screws and washers.This will secure the wall support plate to the
wall.
8. Measure from center and install the second side plate using 5/16 x 2 1/4 inch concrete/masonry
screws and washers.
9. Repeat the above process so that both wall supports and side plates are installed and secure.
10. Install the rear flat support plate using 5/16 nuts and bolts. Mount the duct so the v band is above
the flat support plate and secure by installing the front flat support plate.
11. The v band"V"should be sitting on top of the flat plate.A cut out is provided in the flat plate to allow
the v band bracket to fall through so the"V" is flush with the flat support plate
12. Secure the side support left and right plates to the outer duct shell using the 5/16-18 x 1 inch self
drilling screws. Use the guide holes to locate the shell center and fill all holes center, center left and
center right. A minimum of 18 screws must be used on each side of the duct.
Figure 10D—Concrete/Masonry Wall Vertical Support
WALLSUPPORT 24.000 CONCRETE/MASONRY.
PLATE.
FLAT SUPPORT WALL SU PPOR T
PLATE. PLATE.
16.18 X Y WNIZ FLAT SUPPORT
NUTS&BOLTS. PLATE.
SIDE SUPPORT
PLATE.
44.000
SIDE SUPPORT PLATE-MUST BE INSTALLED
USING 6/16 X 2 1/4'CONCRETE/MASONRY
SCREWS A WASHERS DIRECTLY
INTO THE WALL.
WALL SUPPOR T PLATE-MUST BE INSTALLED
USING 6/18 X21/4 CONCRETE/MASONRY
SIDE SUPPORT SCREWS&WASHERS DIRECTLY
PLATE. INTO THE WALL
70.113 X1'SELF
DRILLING SCREWS.
WALL&SDE SUPPORT PLATE•MUST BE
INSTALLED USING 6116 X2 114 CONCRETE/
MASONRY SCREWS&WASHERS DIRECTLY
INTO THE WALL.
20
Through Penetration & Fire Stops
Through floor fire stop support assemblies are used to support duct sections that penetrate a fire resistant
floor(s). The full support ring is installed under the double V band; the struts are connected to the support
ring with supplied 5/16-18 hardware. Once the struts have been connected they are secured to the floor
using appropriate type and size fasteners supplied by others. The fire stop support is designed to support the
penetrating duct section and maintain annular distance, see Fig. 10b above for details.
When duct systems penetrate a fire resistance rated floor,ceiling and/or a wall, a fire stop kit is used to retain
the fire resistance rating on the floor and/or wall. The double wall grease duct(2R, 3R and 3Z)and the fire
stopassemblies detailed below have achieved 2-hour ratings for integrity, insulation and stability. Testing
9 Y
was conducted in accordance with the applicable requirements UL 2221, Test of Fire Resistive Grease Duct
Enclosure Assemblies.
Table 6—Opening Size Through Penetrations
DUCT MODEL INNER OUTER DIAMETER SQUARE/ROUND
DIAMETER OPENING MIN/MAX
DW-2R 8" 12" 14"- 15"
DW-2R 10" 14" 16"- 17"
DW-2R 12" 16" 18"- 19"
DW-2R 14" 18" 20"-21"
DW-2R 16" 20" 22"-23"
DW-3R/3Z 8" 14" 16"- 17"
DW-3R/3Z 10" 16" 18"- 19"
DW-3R/3Z 12" 18" 20"-21"
DW-3R/3Z 14" 20" 22"-23"
DW-3R/3Z 16" 22" 24"-25"
DW-3R/3Z 18" 24" 26"-27"
DW-3R/3Z 20" 26" 28"-29"
DW-3R/3Z 24" 30" 32"-33"
Annular Distance Fig. 11 —Annular Distance
Grease duct is to be installed eccentrically or concentrically within
the fire stop system. The annular space between the grease duct O.D.PLUS 3 MAX.
and the periphery of the opening shall be a minimum of 1" to a
maximum of 2" for 1 and 2 hour fire rated floor and wall ��E I"MIN.
assemblies. Grease duct to be rigidly supported on both sides of 2„MAX.
the floor and or wall assembly. The F and T rating for the fire stop
systems shown below are rated for 2 hours. The fire stop ratings Pl
are applicable only when Specified Technologies Series SSS Latex i``I FLOOR/CEILING.
Intumescent (STI Triple S) Sealant is used. Annular distance is
measured perpendicular from the outside of the grease duct to the DUCT O.D.
periphery of the opening(see Fig. 11 for details). DUCT.
21
Floor& Ceiling Fire Stop Installation
1. Cut an opening in the floor/ceiling that is a minimum of 2"and maximum of 3"larger than the outside
diameter of the duct being installed(see Table 6).
2. The grease duct can be installed eccentrically or concentrically within the opening.The distance from
the outside of the grease duct to the periphery of the opening cannot exceed 2". 2" is the maximum
annular distance allowed(see Fig. 11).
3. Apply a continuous 1/2"bead of STI Triple S intumescent around the fire plates. The fire plates are
designed to fit around the duct and overlap by 1".
4. The fire plates are installed on the bottom side of the floor/ceiling. Push the plates up to the
floor/ceiling so the intumescent seals the plates against the floor/ceiling. Then secure using 3/4-20 x 1
'/2"long concrete fasteners where the plates overlap, secure using 34-20 x 1"sheet metal screws.
5. Seal the topside using the intumescent seal around the duct and fire plates. Seal the edge of the
opening to the fire plates.
6. Fill the cavity using(4)layers of insulation, make sure that all voids are filled. The insulation is fully
compressed into the opening until it is 3/4'from the top of the opening.
7. Cover the compressed insulation with intumescent. Continue until the intumescent is level with the
top of the opening. The intumescent should overlap on to the floor/ceiling, ensuring there are no
gaps between the edges of the opening or the duct outer shell.
8. Wrap one layer of 1"x 12" provided insulation around the base of the duct and enclose with the half
enclosure bands. The insulation and bands should be touching the intumescent, do not disturb or
compromise the intumesent when installing. The enclosure bands are assembled using 1/4-20 x 3/4'
hardware.
9. Install the vertical fire stop support;ensuring the full support ring is installed under the double V
band. Once in place,the legs are secured to the floor/ceiling using appropriate type and size
fasteners (see Fig. 12 for details).
Fig. 12- Floor& Ceiling Fire Stop Installation
STEP 1 6 STEP 2
1UCT SECTION.
DUCT SECTION. `N
TOP SIDE.
SEE TABLE 6. TOP SIDE.
~r%' INTUMESCENT
• SEALANT
FIRE PLATES. / FIRE PLATES INTUMESCENT
ONCRETE SECURED. SEALANT.
SCREWS.
STEP 3 STEP 4
DUCT SECTION. r'A° DUCT SECTION. a ..
TOP SIDE. .,- DOUBLE V BAND.
NS ULATI ON.
INTUMESCENT r ' CONCRETE VERTICAL SUPPORT.
SEALANT. ANCHORS. ,
HALF CLOSURE HALF CLOSURE /
BANDS. BANDS SECURED.
22
Wall Fire Stop Installation
1. Cut an opening in the wall that is a minimum of 2"and maximum of 3"larger than the outside
diameter of the duct being installed. See Table 6.
2. The grease duct can be installed eccentrically or concentrically within the opening. The distance from
the outside of the grease duct to the periphery of the opening cannot exceed 2". 2" is the maximum
annular distance allowed; see Fig. 11.
3. Apply a continuous'A"bead of STI Triple S intumescent around the closure plates;the fire plates are
designed to fit around the duct and overlap by 1".
4. The fire plates are installed on the backside of the wall. Push the plates up to the wall so the
intumescent seals the plates against the wall. Then secure using 1/4-20 x 1 '/2'long concrete
fasteners where the plates overlap secure using '/4-20 x 1"sheet metal screws.
5. Apply a'/4"covering of intumescent sealant to the inside of the fire plates installed on the backside of
the wall. The sealant should be smooth and without any gaps on the edges of the opening or outside
of duct.
6. Fill the cavity using the insulation provided, ensuring that all voids are filled. The insulation is fully
compressed into the opening until it is 3/4"from the edge of the opening in the wall.
7. Cover the compressed insulation with intumescent. Continue until the intumescent is flush with the
edge of the wall opening. The intumescent should overlap on to the wall, ensuring there are no gaps
between the edges of the opening or the duct outer shell.
8. Install the fire plates on the front side of the wall. Push the plates up to the wall so the intumescent
seals the plates against the wall. Then secure using 1/4-20 x 1 '/2" long concrete fasteners where the
plates overlap secure using 3/4-20 x 1"sheet metal screws.
9. Wrap one layer of 1"x 12"provided insulation around the base of the duct and enclose with the half
enclosure bands. The insulation and bands should be touching the intumescent.The enclosure
bands are assembled using '/4-20 x 1"hardware. This is done on the front and back of the wall.
10.Horizontal supports are used to support the duct on either side of the wall. See Fig.9 for details.
Fig. 13-Wall Fire Stop Installation
STEP 1 STEP 2
WALL.
FIRE PLATES. INSULATION HALF SANDS
CLOSURE
NOP INSULATION. '
Alinj/Mi
DUCT SECTION
OliMkt
CONCRETE
SCREWS. FIRE PLATES r
INTUMESCENT. 1M-20 HARDWARE
WALL.
FIRE PLATES. HORIZONTAL SUPPORT
'Nov_ EITHER SIDE OF OPENING.
INTUMESCENT
HALF CLOSURE
BANDS
-11111
CONCRETE
SCREWS. — „mot/gi
INSULATION. DUCT SECTION.
1/4-20 HARDWARE
DETAIL
23
Grease Duct Assembly Examples
Fig. 14 -Grease Duct Installation Guide r" "° '� s
Adjustable duct and standard ducts are
used to terminate at the transition plate. ys
The duct section is fully welded to theme ,
transition plate at the factory. �
76:
EXHAUST FAN.
VENTED CURB. '. .
ROOF.
VERTICAL SUPPORT
INSTALLED UNDER
THE DOUBLE V BAND. ADJUSTABLE DUCT.
DOUBLE V BAND.
STANDARD DUCT LENGTH.
SEE TABLE 3. INSULATED ACCESS
S tt DOOR COVER/TEE.
qi TANDARD DUCT LENGTH.
DOUBLE V BAND.
STANDARD DUCT LENGTH.
46 DEGREE ELBOW. FIRST VERTICAL SUPPORT
ATJOINT S I AFTER CHANGE
IN DIRECTION INSTALLED UNDER
ADJUSTABLE DUCT. ti;, t •
n4, THE DOUBLE V BAND.
INSULATED ACCESS -
46.
DOOR COVER ITEE. 8 THREADED ROD
ACCESS DOOR PROVIDED
WHEN i lr�iW Wi 66* A p hr irrg ■ N DIRECTIONS R CHANGE
r
RISER COVERS.
STANDARD DUCT LENGTH
EXHAUST HOOD.
-SEETAB LE4.-6.1
DUCT SENSOR
24
Fig. 15 -Grease Duct Installation Guide w ��E � d � ' t` -� `3�
_« r2-1, 14 a gcy'�e� r'`3,�
� „Al, �,..#� � ��
Adjustable duct and standard ducts are t .. , �! 4 - , r�
h�
used to terminate at the transition plate. ;,,,-,,I.,-,,,*.:-:.,. . ' ` a .
The duct section is fully welded to the ` �,, , #
transition plate at the factory. ,. ,; x, T ' '
p x
E
•
EXHAUST FAN. VENTED CUR
ROOF.
ADJUSTABLE DUCT.
VERTICAL SUPPORT
Fe-,-;.`
INSTALLED UNDER -
THE DOUBLE V BAN
D.
DOUBLE I II
V BAND.
.+MID• I.
TEE ACCESS DOORS p,p,i,.,1
_ ,.
STANDARD DUCT LENGTH.
CLEAN OUT POINTS AFTER
.0.3.2
,.-..„...,.,..r
1
CHANGE IN DIRECTION.
INSULATED ACCESS
FIRST VERTICAL SUPPORT - DOOR COVER 1 TEE.
AT JOINT#1 AFTER CHANGE
IN DIRECTION INSTALLED UNDER
THE DOUBLE V BAND,SEE TABLE 5.
RISER COVERS.
1
HORIZONTAL SUPPORT,
SEE TABLE 4. EXHAUST HOOD HEIGHT
HOOD
HOOD 10if
WIDTH
r
.
€ ,
,
25
Fig. 16 -Grease Duct Installation Guide x t
Adjustable duct and standard ducts ares '
used to terminate at the transition plate. , � '
The duct section is fully welded to the „, �, ,�, ,, ,,z,,,,,`f,
transition plate at the factory ;.w�
1 ,,,� .^ tom , s t s 7 ° �'"
�k,, 1,-, fal'4'1'4*''''' a , t A Z
EXHAUST FAN. 1 lin
it
ADJUSTABLE SECTION
VENTED CURB. TERMINATES AT THE
VENTED CURB. IIP Ink TRANSITION PLATE.
iii A ROOFi—' I
.
ADJUSTABLE ' s_
DUCT COLLAR.
ADJUSTABLE VERTICAL SUPPORT
DUCT SECTION. 1; INSULATION INSTALLED UNDER
`t: OUTER SHELL ' iii= THE DOUBLE V BAND
4 W S {.ils REMOVED FOR s s* ¢ `�'.:4 4
CLARITY.
STANDARD DUCT LENGTH. ,ii DOUBLE V BAND. STANDARD DUCT LENGTH.
DUCT SENSOR. DOUBLE V BAND. RISER COVERS.
1 DUCT SENSOR. I
EXHAUST EXHAUST
HOOD HOOD
26
METHODS USED TO TEST DUCT AFTER ASSEMBLY
Prior to the concealment of any portion of a grease duct system, a leakage test shall be performed in the
presence of the code official. Duct shall be considered to be concealed when installed in shafts, or covered
by coatings or wraps that prevent the ductwork from being visually inspected on all sides. A light test or
approved equivalent test method (smoke test)shall be performed to determine that all joints are liquid tight.
The smoke test is used for longer duct runs while the light test is used for short duct runs; both methods are
approved for use.
Method 1 — Light Test per IMC 506.3.3.1
A light test shall be performed by passing a lamp having a power rating of not less than 100 watts through
the entire section of ductwork to be tested. The lamp shall be open so as to emit light equally in all directions
perpendicular to the duct walls. The test shall be performed for the entire duct system, including the hood-to-
duct connection. The ductwork shall be permitted to be tested in sections, provided that every joint is tested.
Method 2 — Smoke Test
After the ductwork has been installed allow the listed sealant to cure for a minimum of 24 hours. Smoke
bombs are lit and placed at the bottom of the duct system; natural upwards drafts will pull the smoke to the
top of the duct system. Various length duct runs may require multiple smoke bombs. Once the smoke has
reached the top of the duct run,cap the duct securely. Inspect all joints for leakage.
GENERAL DUCT WEIGHTS
The average weight of the duct, per foot of length,can be calculated using the following formulas below.
Duct design should provide adequate support to ensure duct components are not overloaded.
Weight— DW-2R
The following formula can be used to approximate the weight of total length of DW-2R double wall duct.
Inner Shell +Outer Shell + Insulation or(.0327*L*D)+[.0218*L*(D+4)] +[.0364*L*(D+2)].
Weight — DW-3R
The following formula can be used to approximate the weight of total lengths of DW-3R double wall duct.
Inner Shell+ Outer Shell+ Insulation or(.0327*L*D)+[.0218*L*(D+6)] +[.0436*L*(D+3)].
Weight — DW-3Z
The following formula can be used to approximate the weight of total lengths of DW-3Z double wall duct.
Inner Shell+Outer Shell+ Insulation or(.0327*L*D)+[.0218*L*(D+6)] +[.0491*L*(D+3)].
Weight— Example
The"D"value in the formulas above represents the inner duct diameter in inches. The"L"value in the
formulas above represents the total length in inches. Duct system: DW-3Z, 12" inner duct, 100 FT long.
Using the DW-3Z formula above, (.0327*1200*12)+(.0218*1200*18)+ (.0491*1200*15)= 1825 lbs.
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CLEANING & MAINTENANCE RECORD
Date Service Performed
Factory Service Department
Phone: 1-866-784-6900
Fax: 1-919-554-9374
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