CaptiveAire DW User manual

A0018672
August 2019 Rev. 32
Non-Welded Double Wall Grease Duct/Type HT Chimney Systems
Installation, Operation, and Maintenance Manual
Save these instructions. This document is the property of the owner of this equipment and is
required for future maintenance. Leave this document with the owner when installation or service
is complete.
FOR YOUR SAFETY
TWO MAJOR CAUSES OF GREASE DUCT RELATED FIRES: (1) FAILURE TO MAINTAIN
REQUIRED CLEARANCE (AIR SPACE) TO COMBUSTIBLE MATERIALS AND (2) FAILURE TO
CLEAN GREASE LADEN DUCTS. IT IS OF UTMOST IMPORTANCE THAT THIS GREASE DUCT BE
INSTALLED ONLY IN ACCORDANCE WITH THESE INSTRUCTIONS. DO NOT INSTALL GREASE
DUCT WITHOUT FIRST READING THESE INSTRUCTIONS VERY CAREFULLY.
RECEIVING AND INSPECTION
EXAMINE ALL COMPONENTS FOR POSSIBLE SHIPPING DAMAGE PRIOR TO INSTALLATION.
DIFFERENT MANUFACTURERS HAVE DIFFERENT JOINT SYSTEMS AND ADHESIVES. DO NOT
MIX PIPE, FITTINGS, OR JOINING METHODS FROM DIFFERENT MANUFACTURERS.

2

3
Table of Contents
WARRANTY ................................................................................................................................................4
LISTINGS ....................................................................................................................................................5
CLASSIFICATIONS .....................................................................................................................................5
APPLICATION .............................................................................................................................................6
Grease Ducts ........................................................................................................................................6
Chimneys ..............................................................................................................................................7
Clearances ............................................................................................................................................8
MECHANICAL ...........................................................................................................................................10
Joint Sealant ....................................................................................................................................... 10
Grease Duct and Chimney Joint Assembly .........................................................................................11
Double Wall Adjustable Duct, Chimney and Transition Plate .............................................................12
Double Wall Adjustable Duct, Chimney Standard Installation .............................................................14
Double Wall Offset Distance ............................................................................................................... 16
Factory and Field (Bolted and Welded) Risers ...................................................................................17
Duct Drains .........................................................................................................................................19
Manifold Tee .......................................................................................................................................19
Access Door (Tee Cap) Assembly ......................................................................................................20
Transition Plate ...................................................................................................................................21
Chimney Adapter Plate ....................................................................................................................... 22
Prevention of Grease Accumulation in Horizontal Grease Duct ......................................................... 23
Alignment & Bracing of Grease Duct ..................................................................................................23
Double Wall Horizontal Support and Support Spacing ....................................................................... 23
Vertical Support & Vertical Support Spacing .......................................................................................25
Double Wall Vertical Support (Wood, Steel, Concrete) .......................................................................29
Double Wall Vertical Ceiling Support ..................................................................................................32
Double Wall Vertical Floor Support (Wood, Concrete, Steel) .............................................................33
Vertical Support Floor and Curb ..........................................................................................................37
Through Penetration and Fire Stops ...................................................................................................38
Annular Distance – Fire Stop ..............................................................................................................39
Annular Distance – 2R Type HT Clearance ........................................................................................39
Floor and Ceiling Fire Stop Installation ...............................................................................................41
Wall Fire Stop Installation ................................................................................................................... 42
Grease Duct Assembly .......................................................................................................................43
Chimney Assembly .............................................................................................................................46
Methods Used to Test Duct After Assembly .......................................................................................49
Method 1 – Light Test per IMC 506.3.2.5 ............................................................................... 49
Method 2 – Smoke Test .........................................................................................................49
Method 3 – Pressure Testing per SMACNA’s HVAC Air Duct Leakage ................................49
GENERAL DUCT WEIGHTS .....................................................................................................................50
CLEANING & MAINTENANCE RECORD .................................................................................................52

4
WARRANTY
This ductwork and chimney system is warranted to be free from defects in material and workmanship,
under normal use and service, for a period of 20-years from the date of shipment. This warranty shall not
apply if:
1. The equipment is not installed by a qualified installer per this installation guide; 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 design or sizing is not approved per MANUFACTURER’S specifications.
4. The equipment is misused, neglected, or not maintained per the MANUFACTURER’S maintenance
instructions.
5. The equipment is exposed to elevated temperatures due to a fire originating in the building, hood, fan,
duct, chimney or kitchen appliances.
6. The equipment is not operated within its published capacity.
7. The equipment is operated, tested or stored in the presence of chlorines, solvents, refrigerant vapors,
caustic substances, halogenated compounds or other conditions which could cause condensation of
corrosive materials within or on the system.
8. The equipment is substituted or connected with parts not manufactured per Original Equipment
Manufacturer.
9. 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 20-year 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.

5
LISTINGS
This Grease Duct has been tested and is listed to UL1978, UL2221, CAN/ULC-S144 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.
This Factory Built Chimney has been tested and is listed to UL103 and UL103HT. Testing has been
extended to recognize ULC/ORD-C959-1993, unenclosed installation and is for commercial use only.
Model 2R Type HT chimney system was subjected to a 30 minute exposure at a flue gas temperature test
at 1125° C above room temperature in accordance with Canadian Standards with acceptable results
attained.
Model 2R Type HT chimney system has been tested and is listed for installations in positive pressure
applications where the chimney is subject to positive pressure rather than negative or neutral pressures.
The chimney system is rated for use at maximum 60 inch water column internal pressure when used in
Positive Pressure Applications.
This chimney system is intended for installation within commercial/industrial applications and is not
intended for use in family dwellings. When installed in accordance with these instructions and National Fire
Protection Association “NFPA 211”; Standard for Chimneys.
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.
UL 103: Standard for Factory Built Chimneys for Residential Type and Building Heating Appliances.
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 36”
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 18” diameter).
Model 2R is listed in accordance with the requirements for duct enclosure Condition B.
Model 2R Type HT is listed under UL103 (Building Heating Appliance Chimney). Insulated double wall
building heating appliance Chimney / Type HT Factory Built Chimney intended for commercial and
industrial applications in sizes 8” through 16” ID.

6
APPLICATION
Grease Ducts
Double wall grease ducts are listed for a continuous internal temperature of 500°F and intermittent
temperatures of 2000°F. 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 Environmental Protection Agency. Grease duct installations require
provisions for cleaning the interior of the duct. NFPA 96 clean-out requirements are as follows:
1. A clean-out 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 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 clean-out
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.
When the 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 fire within the duct. A fire can
burn at extremely high temperatures. The system should be dismantled and inspected after any exposure
to a 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 fire conditions.

7
Chimneys
Factory Built Chimney Model 2R Type HT is listed for continuous internal temperatures of 1000°F US &
600°F Canada, intermittent temperatures of 2100°F. This system is ideally suited for commercial and
industrial application for the removal of smoke and heat, and is rated for use at a maximum 60 inch water
column internal pressure when used in positive pressure applications. Chimney system size and capacity
information may be obtained from the ASHRAE Handbook – Fundamentals or from the Air Pollution
Engineering Manual of the US Environmental Protection Agency.
NOTE: Model 2R Type HT Chimney Systems used for positive pressure applications must be
sealed with the recommended sealant listed in this manual. NO SEALANT SUBSTITUTES MAY BE
USED. Model 2R Type HT Chimney Systems used for neutral or negative pressure applications do
not require joints to be sealed.
When wood is burned slowly, it produces tar and other organic vapors which combine with expelled
moisture to form creosote. The creosote vapors condense in a relatively cool chimney flue of a slow
burning fire. As a result, creosote residue accumulates on the flu lining. When ignited this creosote makes
an extremely hot fire.
Chimney installations require provisions for cleaning the interior of the chimney. Creosote and soot
formations need to be removed. The chimney should be inspected once every two months during the
heating season to determine if creosote or soot buildup has occurred. If creosote or soot has accumulated,
it should be removed to reduce the risk of fire. Clean-out requirements are as follows:
1. A clean-out must be provided at each change of direction, except where the entire length of chimney
can be inspected and cleaned from either the equipment or the chimney cap.
2. Openings must be at the side or the top, whichever is more accessible.
3. The chimney inspection should be done every two months during the heating season.
4. If creosote or soot has accumulated it should be removed to reduce the risk of fire.
5. Insert the chimney cleaning brush and brush in a downward motion, be sure to scrub all sides of the
chimney thoroughly and remove all debris.
6. Contact local building or fire officials about restrictions and inspections in your area.
NOTE: Model 2R Type HT Factory Built Chimney Systems are intended for commercial and
industrial applications. This system is not intended for family dwellings. Chimney Systems should
be sized in accordance with the appliance manufacturer’s instructions.
When the chimney system is installed in accordance with these installation instructions and the joints are
sealed properly with the recommended sealant, the system will contain a fire within the chimney. A fire can
burn at extremely high temperatures. The system should be dismantled and inspected after any exposure
to a 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 chimney system cannot be responsible for chimney
systems that are not properly maintained or have been subjected to one or more fire conditions.

8
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 an enclosure is not required, double wall grease duct or chimney systems
may be located near combustible material to reduce clearance in accordance with Table 1. When
combining double wall and single wall grease duct for the purpose of clearance reduction, a Double Wall
End Cap Assembly is required.
The information in Table 1 represents air space, in inches, to surroundings.
Refer to the latest edition of NFPA 96, Chapter 3 Definitions. This chapter explains the definitions
on combustible, non-combustible and limited combustible material.
(1) 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.
(2) DW - 2R: 1” 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 - 2R TYPE HT: unenclosed, 2” clearance to combustibles from the surface of the chimney outer
shell.
(4) DW - 3R: 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.
NOTE: Double wall duct systems with reduced clearance “R” have been tested using condition B –
installed within non-ventilated unenclosed combustible enclosure. See Figure 1 for representation
of reduced clearance note, the V-band may be in contact with a combustible surface.
Table 1 - Grease Duct and Building Heating Appliance Chimney Clearances
Duct Model Inner Diameter
(ID)
Outside
Diameter
Clearance to
Combustibles
Clearance to
Non-Combustibles
DW 8”-36” = ID 18” 0”
DW - 2R
8”-16” ID + 4 3/4” (1) 0”
18” ID + 4 1” (2) 0”
DW - 2R TYPE HT 8”-16” ID + 4 2” (3) 0”
DW - 3R 8”-24” ID + 6 3/4” (4) 0”
DW - 3Z 8”-36” ID + 6 0” 0”

9
Figure 1 - Grease Duct Reduced Clearance
Figure 2 - 2R Type HT Chimney Reduced Clearance
3
2
A
1
1. Combustible Surface
2. Duct
3. Double V-band
A. Reduced Clearance
• 2R 8”-16” = 3/4”
• 2R 18” = 1”
• 3R = 3/4”
3
A
B
2
1
A
C
1. Hardware
2. Combustible Surface
3. Clearance Plates
A. 2” Reduced Clearance
B. 2R Type HT Shell + 4-1/2”
C. 2R Type HT Shell Outer Diameter

10
MECHANICAL
Joint Sealant
Proper joint assemble is essential for a safe installation. Follow these instructions exactly as
written Check severeness of joints upon completion of assembly.
The joint sealant used to seal all joint assemblies is 3M Fire Barrier 2000+ Silicone Sealant. This 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 a 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. Model 2R Type HT chimney used in positive pressure applications must
be liquid tight per UL103 and UL103HT listing. Model 2R Type HT chimney used in neutral or negative
pressure applications does not require joints to be sealed with the 3M Fire Barrier 2000+ Silicone Sealant
per the listing report. When Model 2R Type HT chimney is used in neutral or negative pressure
applications, the system does not require the joints to be sealed; it is recommended for commercial
cooking appliances where grease is present.
NO SEALANT SUBSTITUTES MAY BE USED.
Sealant Features
1. Superior adhesion.
2. Capable of withstanding 2000°F + temperatures.
3. Class 25 sealant, per ASTM C920.
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. Full cure time: 14 to 21 days.
9. The duct/chimney system can be placed in operation 7 days after installation, prior to full cure.
10. Applied with a standard caulk gun.
Table 2 - Sealant Usage Chart
3M Fire Barrier 2000 Plus Usage
Diameter Duct Perimeter Feet Average Feet Per Tube Number of 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
22” 5.83 30 2.5
24” 6.35 30 2.5
30” 7.98 30 1.5
36” 9.55 30 1

11
Grease Duct and Chimney Joint Assembly
All grease ducts are to be liquid tight per NFPA 96. Model 2R Type HT chimney used in positive pressure
applications must be liquid tight per UL103 and UL103HT listing. When a chimney system is used in a
positive pressure application, it must be fitted with an internal joint collar and sealed as shown in Figure 3
(positive pressure only). When a chimney system is used in a negative or neutral pressure application, it
does not need to be sealed per the listing report; although, sealing the system is recommended for
commercial cooking appliances where grease is present.
1. Fill the V-band with 3M Fire Barrier 2000+ Silicone. The bead should be continuous. See Table 2 for
the number of tubes per joint. For neutral and negative chimney or grease duct applications, proceed
to step 4.
2. For positive pressure chimney applications: Apply a 1/4” wide continuous bead of 3M Fire Barrier
2000+ Silicone around the formed bead on the internal joint collar. Push down into the chimney section
being assembled.
3. For positive pressure chimney applications: The internal joint collar should be pushed down into the
chimney section until the bead sits on the chimney flange.
4. 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.
5. Join the two flanged ends of the inner duct sections together and rotate slightly to ensure complete
coverage of sealant on flanges.
6. For horizontal duct runs, the V-band hardware should be located on the top side of the duct and
orientated between the 3 and 9 o’clock position on the duct.
7. NEVER install the V-band with hardware orientated on the bottom side of the duct on horizontal runs.
8. 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 1/4”-20 hardware between 40-60 in-lbs. Smooth out any
excess sealant from inside of the duct surface.
9. Insulation must be minimum of 4-1/2” 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.
10. Install the double V-band ensuring the outer shell flanges are positively engaged in the V-bands before
tightening the 1/4”-20 hardware between 40-60 in-lbs. The double V-band can be sealed using 3M
Fire Barrier 2000+ Silicone when being installed outside.
Figure 3 - Duct and Chimney Joint Assembly
IMPORTANT: THE HARDWARE USED TO ASSEMBLE THIS DUCTWORK/CHIMNEY IS
SPECIFICALLY DESIGNED FOR THIS APPLICATION. NO SUBSTITUTE HARDWARE IS ALLOWED.
ALL REPLACEMENT HARDWARE MUST BE PURCHASED FROM THE FACTORY.
1
2
4
3
5
6
1
1. 3M Fire Barrier Silicone
2. V-band
3. Internal Joint Collar
(Positive Pressure
Chimney)
4. First Duct Section
5. Second Duct Section
6. Double V-band

12
Double Wall Adjustable Duct, Chimney and Transition Plate
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
Figure 13. When a Model 2R Type HT chimney system is used in positive pressure applications, it must
be fitted with an internal joint collar and sealed as shown in Figure 3. When a chimney system is used in a
negative or neutral pressure application, it does not need to be sealed per the listing report; although,
sealing the system is recommended for commercial cooking appliances where grease is present. Refer to
Figure 4 for assembly details.
1. The 7” standard duct section in the adjustable assembly is installed the same as the “Grease Duct
and Chimney Joint Assembly” on page 11.
2. When adjustable duct assemblies are used with transition plates, the 7” standard section is connected
to the mating duct section. The adjustable duct with single flange is welded to the transition plate.
3. The adjustable collar is slipped onto the adjustable section. Make sure the adjustable collar flanges
are opposite the adjustable duct section flange.
4. The adjustable section is pushed inside the 7” standard section. Verify the minimum overlap is set
correctly, refer to Table 3.
5. If the protruding section interferes with mating parts in the duct run, you will need to cut the adjustable
section that is interfering with mating parts, refer to Figure 5.
NOTE: For Positive Pressure Applications - If the adjustable section is used in a positive pressure
chimney application, the adjustable section may need to be cut to length. This will prevent
interference with the internal joint collar. Refer to Figure 4 for adjustable section installation.
6. Once the overlap is set correctly, apply 3M Fire Barrier 2000+ Silicone to the flanges of the duct
section and the adjustable collar.
7. Apply 3M Fire Barrier 2000+ Silicone to the single V-band groove. Install single V-band around
adjustable collar flange and standard duct flange. Tighten the single V-band hardware to 40-60 in-lbs.
8. Once the single V-band has been installed, tighten the adjustable collar hardware to 40-60 in-lbs.
9. Measure the distance between mating duct flange and transition plate prior to installing insulation and
outer shell cover.
10. Subtract 1” from the measured distance and cut the pre-rolled shell to this dimension.
11. After the single wall adjustable section has been installed, wrap the assembly using blanket insulation
provided. Make sure all voids are adequately filled.
12. Wrap the pre-rolled outer shell cover around the insulation. Ratchet strap(s) may be used around outer
shell to aid in compressing insulation.
13. Install the double wall V-band on either end of the assembly. Make sure the double wall V-band is
secured onto the mating duct flange and overlapping onto the shell before tightening hardware.
14. The double wall V-band will close the pre-rolled shell as they are tightened. Once closed, secure the
outer shell cover along the seam using the 1” sheet metal screws that have been provided.
15. Use 3M Fire Barrier 2000+ Silicone to seal the outer shell, if required or installed outside.
NOTE: Outer Shell Must Extend Behind the Double Wall V-band.

13
Figure 4 - Adjustable Duct, Chimney and Transition Plate
Figure 5 - Adjustable Duct and Chimney Overlap
NOTE: Protruding section may need to be cut in the field if there is interference with mating parts
in the duct run.
NOTE: When installing duct, verify directional label is in the correct direction of airflow.
(Exception: When grease is draining in a downward slope, the arrow should be opposite of airflow).
X
X-1"
1
2
3
4
5
6
14
8
9
11
12
13
10
7
1. Transition Plate
2. Adjustable Collar
3. 3M Fire Barrier 2000 Plus
4. 7” Standard Duct Section
5. Mating Duct Section
6. Adjustable Duct Section
7. Single V-band
8. Outer Shell Cover
9. Insulation
10. Curb
11. Sheet Metal Screws
12. Double Wall V-band
13. Shell Overlap
14. Mating Duct Flange
X. Measured Distance
1. Duct Section
2. Double Wall V-band
3. Outer Shell Cover - Cut to size
4. Adjustable Collar
5. Single V-band
6. Adjustable Duct Section
A. Adjustable Section Protrusion -
May need to be cut
B. Minimum Length
C. Diameter
D. Maximum Length
E. Minimum Overlap
D
E
C
2
5
6
3
B
A1
FLOW DIRECTION
4

14
Double Wall Adjustable Duct, Chimney 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/appliance
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”. When a Model 2R Type HT chimney
system is used in positive pressure applications, it must be fitted with an internal joint collar and sealed as
shown in Figure 3. When a chimney system is used in a negative or neutral pressure application, it does
not need to be sealed per the listing report; although, sealing the system is recommended for commercial
cooking appliances where grease is present.
1. The 7” standard duct section in the adjustable assembly is installed the same as the “Grease Duct
and Chimney Joint Assembly” on page 11.
2. The adjustable collar is slipped onto 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 7” standard duct section. Verify the minimum overlap is set
correctly, refer to Table 3.
4. If the protruding section interferes with mating parts in the duct run, you will need to cut the adjustable
section that is interfering with mating parts, refer to Figure 5.
5. Once the overlap is set correctly, apply 3M Fire Barrier 2000+ Silicone to the flanges of the duct
section and the adjustable collar.
NOTE: For Positive Pressure Applications - If the adjustable section is used in a positive pressure
chimney application, the adjustable section may need to be cut to length. This will prevent
interference with the internal joint collar. Refer to Figure 6 for adjustable section installation.
6. Apply 3M Fire Barrier 2000+ Silicone to the single V-band groove. Install single V-band around
adjustable collar flange and standard duct flange. Tighten the single V-band hardware to 40-60 in-lbs.
7. Once the single V-band has been installed, tighten the adjustable collar hardware to 40-60 in-lbs.
8. Measure the distance between mating duct flanges prior to installing insulation and outer shell cover.
9. Subtract 1” from the measured distance and cut the pre-rolled shell to this dimension.
10. After the single wall adjustable section has been installed, wrap the assembly using blanket insulation
provided. Make sure all voids are adequately filled.
11. Wrap the pre-rolled outer shell cover around the insulation. Ratchet strap(s) may be used around outer
shell to aid in compressing insulation.
12. Install the double wall V-band on either end of the assembly. Make sure the double wall V-band is
secured onto the mating duct flange and overlapping onto the shell before tightening hardware.
13. The double wall V-band will close the pre-rolled shell as they are tightened. Once closed, secure the
outer shell cover along the seam using the 1” sheet metal screws that have been provided.
14. Use 3M Fire Barrier 2000+ Silicone to seal the outer shell, if required or installed outside.
NOTE: Outer Shell Must Extend Behind the Double Wall V-band.

15
Figure 6 - Collar and Adjustable Duct, Chimney Installation
Table 3 - Minimum Overlap
Diameter Minimum Overlap for Adjustable Sections
8” 4”
10” 5”
12”, 14”, 16”, 18”, 20”, 22”, 24”, 30”, 36” 6”
-1"
X
1
2
3
4
5
6
8
9
10
11
10
12
13
12
13
7
X
1. Duct Section 1
2. Adjustable Collar
3. 3M Fire Barrier 2000 Plus
4. 7” Standard Duct Section
5. Duct Section 2
6. Adjustable Duct
7. Single V-band
8. Outer Shell Cover
9. Insulation
10. Double Wall V-band
11. Sheet Metal Screws
12. Mating Duct Flange
13. Shell Overlap
X. Measured Distance

16
Double Wall Offset Distance
Figure 7 - Offset Details
Table 4 - Offset Distance
Offset Center Line Distance 15 Degree Elbows Offset Center Line Distance 30 Degree Elbows
Diameter Flange
Diameter Part Number HT 1 CL 1 Diameter
Flange
Diameter Part Number HT 1 CL 1
8" 9" DW0815DWASY 19-3/4" 2-1/2" 8" 9" DW0830DWASY 20-7/8" 5-1/2"
10" 11" DW1015DWASY 20-3/8" 2-5/8" 10" 11" DW1030DWASY 21-7/8" 5-7/8"
12" 13" DW1215DWASY 20-7/8" 2-3/4" 12" 13" DW1230DWASY 22-7/8" 6-1/8"
14" 15" DW1415DWASY 21-3/8" 2-7/8" 14" 15" DW1430DWASY 23-7/8" 6-3/8"
16" 17" DW1615DWASY 21-7/8" 2-7/8" 16" 17" DW1630DWASY 24-7/8" 6-5/8"
18" 19" DW1815DWASY 22-3/8" 3" 18" 19" DW1830DWASY 25-7/8" 7"
20" 21" DW2015DWASY 22-7/8" 3" 20" 21" DW2030DWASY 26-7/8" 7-1/8"
22" 23" DW2215DWASY 23-3/8" 3-1/8" 22" 23" DW2230DWASY 27-3/8" 7-3/8"
24" 25" DW2415DWASY 23-7/8" 3-1/8" 24" 25" DW2430DWASY 28-7/8" 7-3/4"
30” 31” DW3015DWASY 25-1/2” 3-3/8” 30” 31” DW3030DWASY 31-7/8” 8-1/2”
36” 37” DW3615DWASY 27-1/8” 3-1/2” 36” 37” DW3630DWASY 34-7/8” 9-3/8”
Offset Center Line Distance 45 Degree Elbows
Diameter Flange Diameter Part Number HT 1 CL 1
8" 9" DW0845DWASY 21" 8 3/4"
10" 11" DW1045DWASY 22-1/2" 9-3/8"
12" 13" DW1245DWASY 23-7/8" 9-7/8"
14" 15" DW1445DWASY 25-3/8" 10-1/2"
16" 17" DW1645DWASY 26-3/4" 11"
18" 19" DW1845DWASY 28-1/8" 11-5/8"
20" 21" DW2045DWASY 29-1/2" 12-1/4"
22" 23" DW2245DWASY 30" 12-7/8"
24" 25" DW2445DWASY 32-3/8" 13-3/8"
30” 31” DW3045DWASY 36-5/8” 15-1/4”
36” 37” DW3645DWASY 40-7/8” 17”
15 DEGREE ELBOW
CL 1.
DIA.
HT 1.
CL 1.
DIA.
HT 1.
30 DEGREE ELBOW
CL 1.
DIA.
HT 1.
45 DEGREE ELBOW
15°
30°
45°

17
Factory and Field (Bolted and Welded) Risers
There are two options for the riser, this is the connection to hood plenum. There may be welded (factory or
field) or bolted.
Dimensional data identifying the size and location of the riser must be provided for factory installation. The
riser is fully welded to the hood plenum.
When field installed, the riser is shipped loose allowing the installer at the jobsite to decide on the final
location of the riser. Field installed risers help when the final location is not known, or adjustments may
need to be made due to duct misalignments. Field installed risers may be welded or bolted in place.
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: Verify the hole location is inside the plenum area before cutting any holes.
3. Use the single piece riser ring as a template to mark the bolt hole locations. Align the inner circles of
the hole in the plenum with the single piece riser ring. Mark the bolt hole circle. Make sure the bolt hole
circle is inside the plenum area before cutting.
4. Use 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 1/4” 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. Make sure the two piece riser ring on the riser is pushed down into the sealant. Sealant should
come through the holes on the ring.
6. Align the single piece riser ring to the hole on the inside of the plenum and push into the silicone.
7. Align the two piece riser ring above the hood and bolt the rings together using 1/4”-20 bolts and nuts.
Make sure the tabs are on top.
NOTE: The bolt head must be installed on the plenum side. This is the bottom side of the hood
plenum.
8. Excess silicone should be removed, and the connection should be inspected for gaps and loose
hardware.
9. When joining duct to the riser, refer to “Double Wall Connection to Riser” on page 18.
Figure 8 - Field Installed Riser (Bolted)
6
7
3
1
2
3
4
5
1. 3M Fire Barrier 2000+ Silicone
2. Riser
3. Two Piece Riser Ring
4. 1/4”-20 Nuts
5. 1/4”-20 Bolts
6. Single Piece Riser Ring
7. Top of Hood

18
Double Wall Connection to Riser
1. After the riser has been installed, see “Factory and Field (Bolted and Welded) Risers” on page 17,
connect the double wall section to the riser.
2. Connect the duct/chimney section to the riser, refer to steps 1 through step 3 in “Grease Duct and
Chimney Joint Assembly” on page 11.
3. After the riser and inner section(s) have been connected, install the provided insulation. Make sure all
voids are filled.
4. Install the riser covers by pushing the two halves together and secure with provided sheet metal
screws. Use only hardware provided, longer screws may penetrate the inner section(s).
5. Place the outer V-band around the double wall duct/chimney shell flange and riser cover. Make sure
the V-band engages the outer shell flange and overlaps the riser before tightening.
6. The slot in the riser cover provides an opening for the installation of duct stat sensors if required.
Figure 9 - Duct to Riser Connection
7
1
2
3
4
5
6
4
Inner Section
Assembled
Outer Section
Assembled
1. Double Wall Duct/Chimney
2. Inner V-band - Connecting riser to inner
section
3. Outer V-band - Connecting riser cover to
double wall section
4. Riser Cover
5. Insulation
6. Sheet Metal Screws
7. Opening for Duct Stat Installation

19
Duct Drains
Drains are used to provide a point at which low points in the duct system can be drained. Condensation
and low lying water left over from duct cleaning can be drained easily with the installation of a ball valve
drain. Drains are designed to aid in duct cleaning and can be used to drain accumulation into an approved
collection reservoir. Drains can be hard piped to an approved collection reservoir, remove the cap and
connect to the 1-1/2” NPT threads.
Figure 10 - Duct Drain
Manifold Tee
The manifold tee is used to provide access for clean-out 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 clean-out 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. Access ports should never be located where grease can build up and fall out once the clean-
out cap is removed or where the access door collar cannot be removed to gain access to the inner duct.
Figure 11 - Tee Position
1
2
3
4
5
3
1. V-band
2. Duct Section
3. Adapter Section
4. Drain
5. Tee
12
3
4
5
6
7
1. Outer Duct Shell
2. Access Door - Right Side
3. Inner Duct Shell
4. Access Door - Left Side
5. Access Door - Top Side
6. Grease Dam and Gasket
7. Insulation

20
Access Door (Tee Cap) Assembly
Access doors (tee caps) are available 8” to 36”. They work in conjunction with the manifold tee as shown
on “Manifold Tee” on page 19. The tee joint connection is the same as the joint assembly method, refer
to “Grease Duct and Chimney Joint Assembly” on page 11; however, the installation of the access
door is slightly different. 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 “Grease Duct and Chimney Joint Assembly” on
page 11, except for the access door.
3. Apply the proper sealant to the flange of the tee that will be used for access door to the duct system.
4. Apply a 1/4” continuous bead around the tee flange.
5. Center the grease dam (inside blank) over the opening of the tee and apply pressure. Pushing the
inside blank down onto the tee flange sealant, securing the inside blank to the tee flange.
6. Apply enough pressure to create a positive bond between the tee flange and the inside blank. Remove
excess sealant after making parts concentric (centered).
7. Apply a 1/4” continuous bead around the inside blank 1” from the outside edge.
8. Center the listed gasket over the inside blank and push the gasket down into the sealant securing the
gasket to the inside blank.
9. Sealant will begin to cure upon exposure to atmospheric humidity. It will form a flexible seal.
10. Once the sealant is dry attach the access door using a V-band. Verify flanges are in the “V” before
tightening 1/4”-20 hardware. Tighten between 40 - 60 in-lbs.
11. Once the inner access door assembly is complete, install the outer access door or access door shell.
12. The outer access door shell is used to seal the inner access door with insulation.
Figure 12 - Access Door Assembly
1. Inner Duct Tee
2. Grease Dam (Inside Blank)
3. Gasket
4. Outer V-band
5. Outer Access Door
6. Outer Shell
7. 3-Layer Access Door Insulation
8. Inner Access Door
9. Inner V-band
10. Outer Duct Shell
11. Insulation
1
2
3
4
5
6
7
8
9
10
11