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.

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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.

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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”

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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

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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