DuraVent DuraStack User Manual
INSTALLATION
INSTRUCTIONS
Boiler and Engine Exhaust Chimney Systems
Grease Duct Systems
Double Wall Construction Positive Pressure Chimney Systems
MODELS DIS / DAS
DIS: INSULATED
DAS: UNINSULATED
This installation manual will enable you to obtain a safe, efficient and
dependable installation of this positive pressure chimney system.
Please read and understand these instructions before beginning your
installation.
(DIS only)
Listed to standards:
UL 103 and ULC S604
UL-1978 (DIS only)
ULC/ORD-C959 540°C and 760°C
Report # 3162834
Do not alter or modify the components of this chimney system under any
circumstances. Any modification or alteration of the chimney system
or approved accessories, including but not limited to the appliance
it is connected to, may void the warranty, listings and approvals of
this system and could result in an unsafe and potentially dangerous
installation.
SUITABLE FOR POSITIVE PRESSURE VENTING APPLICATIONS WITH
MAXIMUM 60” WATER COLUMN INTERNAL STATIC PRESSURE AT
1000 DEGREES F.
SAVE THESE INSTRUCTIONS
FOR FUTURE REFERENCE
WARNINGS
FAILURE TO FOLLOW THESE INSTALLATION
INSTRUCTIONS COULD CAUSE FIRE, CARBON
MONOXIDE POISONING, OR DEATH. IF YOU ARE
UNSURE OF INSTALLATION REQUIREMENTS, CALL
THE PHONE NUMBER LISTED ON THE BACK OF
THESE INSTRUCTIONS.
A MAJOR CAUSE OF CHIMNEY RELATED FIRE IS
FAILURE TO MAINTAIN REQUIRED CLEARANCES
(AIR SPACES) TO COMBUSTIBLE MATERIALS. IT
IS OF UTMOST IMPORTANCE THAT THIS CHIMNEY
BE INSTALLED ONLY IN ACCORDANCE WITH THESE
INSTRUCTIONS.
PIDIS REV. 2 04/2013
TABLE OF CONTENTS
Introduction ............................................................................ page 2
Testing / listing information .................................................... page 2
Section A - General information ................................ page 2
Features ............................................................................. page 2
Application ......................................................................... page 3
Surrounding / enclosure .................................................... page 3
Boiler and engine exhaust .......................................... page 3
Grease duct ................................................................ page 3
System sizing .................................................................... page 3
Part numbers ..................................................................... page 4
Effective length .................................................................. page 4
Clearances ......................................................................... page 4
Opening through combustible construction ....................... page 4
Chimney and fitting joint assembly .................................... page 5
Support methods and height limits .................................... page 6
Thermal expansion ............................................................ page 6
Chimney weight ................................................................. page 7
Chimney guying and spacing ............................................. page 7
Termination height ............................................................. page 8
Multi-engine exhausts not recommended .......................... page 8
Section B - Tees, elbows, increasers .......................... page 9
Tees ................................................................................... page 9
Increaser, step or tapered .................................................. page 10
Elbows ............................................................................... page 10
Offsets ............................................................................... page 11
Section C - Structural support and guiding .................... page 12
Anchor plate ..................................................................... page 12
Length Anchor Plate .......................................................... page 12
Anchor plate ventilated ...................................................... page 12
Wall support ..................................................................... page 14
Wall guide ......................................................................... page 14
Floor guide ........................................................................ page 15
Suspension band ............................................................... page 15
Roof brace ......................................................................... page 16
Guy wire ........................................................................... page 16
Section D - Roof and wall penetrations ........................ page 17
Roof / floor penetration .................................................... page 17
Wall penetration ................................................................. page 17
Section E - Terminations, starting adaptors, drain length
and relief valve ............................................ page 18
Single wall adaptor ............................................................ page 18
ANSI flange adaptor ........................................................... page 18
Flanged adaptor ................................................................. page 18
DIS/DAS to DCT and DCT to DIS/DAS adaptor .................. page 18
Rain cap ............................................................................. page 19
Finishing cone ................................................................... page 19
Flip top ............................................................................... page 19
Miter cut ............................................................................ page 19
Drain length ....................................................................... page 20
Relief valve ........................................................................ page 20
Section F - Thermal expansion ................................... page 21
Thermal expansion ............................................................ page 21
Expansion joints installation .............................................. page 21
Bellows expansion joint ..................................................... page 21
Adjustable length ............................................................... page 23
Variable length ................................................................... page 24
Section G - Grease duct application ................................page 26
Access ...............................................................page 26
Use and installation of individual parts ........................page 26
Horizontal drain length ...........................................page 26
Nozzle section ......................................................page 26
Square to round adaptor .........................................page 26
Grease tee 90° .....................................................page 27
Grease tee Y ........................................................page 27
No tool access door ...............................................page 28
Fan adaptor plate ..................................................page 29
Maintenance ........................................................page 29
Section H - Markings ..................................................page 30
2
Product reference information ......................................page 32
INTRODUCTION
Duravent Model DIS or DAS Chimney are cylindrical, prefabricated,
modular venting systems incorporating
designed for both quick assembly and pressure sealing capability. Model
DIS incorporates a
The circular cross section and high quality stainless steel inner
lated.
flue construction provide for a system with high strength-to-weight ratio
and low friction losses.
2” of mineral fiber insulation while DAS is air insu-
a unique extended inner flange
TESTING / LISTING INFORMATION
Duravent model DIS and DAS venting systems are listed with Intertek
Testing Services (ETL) to UL/ULC standards:
U.S.A.
• UL-103
- 60 in. Positive Pressure Chimney
- Building Heating Appliance Chimney
- 1400°F Chimney
• UL-1978 Grease Duct
(DIS only)
CANADA
• ULC/ORD C959
- 540°C (1000°F)
- 760°C (1400°F)
• ULC S604
Models DIS and DAS are code compliant when installed as per the
Installation Instructions with : NFPA211; NFPA31; NFPA37; NFPA96
and CSA-B149
When installed in accordance with it’s installation, Models DIS and DAS
comply with the following codes :
- NFPA (National Fire Protection Association)
- SBCCI (Southern Building Code Congress International)
- ICBO (International Conference of Building Officials)
- BOCA (Building Officials and Code Administrators)
- ICC (International Code Congress)
SECTION A - GENERAL INFORMATION
These instructions comprise both general guidelines and special requirements for all parts in the product line. Before specifying a design
or beginning an installation please carefully review these instructions.
Maintenance Notes:
Chimney Cleaning: This applies to cleaning other than standard natural
gas chimney applications where minimal maintenance is necessary.
Keep your chimney clean. Access should be provided for the inspection and cleaning of all sections of the chimney. Have your chimney
cleaned by qualified chimney sweep. It is recommended to use a nylon
chimney brush of the correct size. Do not use a brush that will scratch
the stainless steel interior of the chimney.
FEATURES
Models DIS and DAS are prefabricated modular venting systems design
for industrial and commercial applications. It has a unique extended inner flange for both quick assembly and pressure sealing capability. It
is a double wall construction with 2” of mineral fiber insulation for DIS
and 2” air space for model DAS. The inner flue is made of high quality
stainless steel plasma welded.
APPLICATION
UL 103 Building Heating Appliance Chimney Listing:
Duravent models DIS and DIS chimney may penetrate a combustible
floor, wall or roof using the appropriate parts and openings sizes. See
section D “Roof & Wall Penetration” for more details.
Under this category, models DIS and DAS have been determined suitable
for venting flue gases at temperatures not exceeding 538°C (1000°F)
under continuous operating conditions from gas, liquid, oil or solid fuel
fired appliances. Also complies with operation (less than one hour)
at temperatures not exceeding 740°C (1400°F) and brief operation
(maximum 10 minutes) at temperatures not exceeding 906°C (1700°F).
Building Heating Appliance Chimneys are suitable for use with Building Heating Appliances and Low Heat Appliances as described in the
Chimney Selection Chart of National Fire Protection Association (NFPA)
Standard NO. 211.
UL 103 1400°F Chimney Listing:
Under this category, models DIS and DAS have been determined suitable
for venting flue gases at temperatures not exceeding 760°C (1400°F)
under continuous operating conditions from gas, liquid, oil or solid
fuel fired appliances. Also complies with brief operation (maximum 10
minutes) at temperatures not exceeding 906°C (1700°F). As such, it is
suitable for use with ovens and furnaces as described in the Chimney
Selection Chart of NFPA No. 211, in addition to other applications.
UL 103 Positive Pressure Listing:
Under this category, models DIS and DAS have been determined suitable for use at a maximum of 60 inch water column internal pressure.
ULC-C959 540°C and 760°C Industrial Chimneys Listing:
Under this category, models DIS and DAS have been determined suitable
for venting flue gases at temperatures not exceeding 760°C (1400°F)
under continuous operating conditions from gas, liquid, oil or solid
fuel fired appliances. Also complies with brief operation (maximum 10
minutes) at temperatures not exceeding 980°C (1800°F).
UL 1978 Grease Ducts Listing (DIS only):
Duravent model DIS chimney is tested in accordance with UL 1978
Standard and approved for Grease Duct applications when installed in
accordance with these installation instructions and National Fire Protection Association standard “NFPA 96, Standard for Ventilation Control
and Fire Protection of Commercial Cooking Operations”.
SURROUNDINGS / ENCLOSURE
Where, according to local code, no chase enclosure is necessary, models
DIS and DAS chimney may be placed adjacent to walls of combustible
construction at the clearance specified on each chimney section and
in the individual listing; see “CLEARANCES”. Contact local building or
fire officials about restrictions and installation inspection requirements
in your area.
Grease Ducts (DIS Only)
1. Model DIS grease ducts are primarily intended for installation in
noncombustible surroundings or in unenclosed installations.
2. Where model DIS grease ducts are installed in an open room and an
enclosure is not required, the minimum clearance to adjacent combustible walls shall be as shown in this section (see “CLEARANCES”). The
ducting may be located in a corner formed by two walls of combustible
construction, if the conditions above are met.
3. Other interior installations in all buildings should be as follows:
a) Where a grease duct penetrates a wall or ceiling rated for fire re-
sistance, it should be enclosed with a continuous non-combustible
enclosure extending from the lowest fire-rated ceiling or floor
above the hood, through any concealed space, to or through the
roof so as to maintain the integrity of the fire separations required
by the applicable building code provisions. The enclosure shall be
sealed around the duct at the point of penetration of the lowest
fire-rated ceiling or floor above the hood, in order to maintain the
fire resistance rating of the enclosure and shall be extended to
the exterior of the building through weather-protected openings.
b) A grease duct penetrating a ceiling, floor or wall which does not
have a fire resistance rating does not require to be enclosed, if
the clearances to combustibles are at the correct minimum for
unenclosed installations.
c) Where model DIS grease ducts extend through any story of a
building above the floor on which the connected appliances are
located, they shall be enclosed in the upper stories with walls
having a fire resistance rating of not less than one hour for
buildings of two or three stories. If the building is four stories
or more, the enclosure wall shall have a fire resistance rating of
not less than two hours.
4. Combustible roofs or roof-ceiling assemblies may be penetrated as
described in Section D – Roof and wall penetrations.
NOTE: Do not enclose with combustible materials. Refer to NFPA 96,
“ Standard For Ventilation Control And Fire Protection Of Commercial
Cooking Operations”, for installation and clearances of fire-rated
enclosures and definitions.
Boiler and Engine Exhaust
Duravent models DIS and DAS chimney are primarily intended to be
used in fire resistive noncombustible surroundings or installed unenclosed. They are not intended for use in one or two family residences.
(CAUTION: Do not enclose this chimney in a chase or passageway of
ordinary wood or other combustible material).
Where the chimney extends through any zone of a building (outside
that in which the heating appliance connected to it is located), it shall
be provided with an enclosure having a fire resistance rating equal to
or greater than that of the floor, wall or roof assemblies through which
it passes.
SYSTEM SIZING
Complete system sizing and capacity information maybe obtained from
the “Chimney, Gas Vent, and Fireplace Systems” chapter of the ASHRAE
Handbook (go to www.ashrae.org for more information). In spite of these
general sizing guidelines, it is most important that the heating appliance,
engine or turbine manufacturer’s installation instructions are followed.
Not following the equipment manufacturer’s instructions may result in
inadequate chimney performance and/or a violation of the equipment
manufacturer’s installation requirements.
3
PART NUMBERS
OPENING THROUGH COMBUSTIBLE CONSTRUCTION
These instructions identify major model DIS / DAS parts by name and
part number.
Example:
DIS 36” length with inside diameter 14” made of ss316 inner flue and
ss304 outer casing.
DIS 14 L36 BC
Model Dia. Part Material
DAS 30° elbow with inside diameter 22” made of ss304 inner flue and
galvalume outer casing.
DAS 22 E30 CE
Model Dia. Part Material
DIS wall support for 8” diameter chimney made of galvalume.
DIS 8 WS E
Model Dia. Part Material
Use only factory-supplied components. Failure to do so will
void the certification and the warranty of the chimney system.
EFFECTIVE LENGTH
DIS / DAS
When assembling two parts together, the joint will overlap 5/8”. So effective length is nominal length minus 5/8”
Example:
Effective length
L36
L24
L18
L12
35-3/8”
23-3/8”
17-3/8”
11-3/8”
CLEARANCES
The following table serves to identify the minimum opening required when
installing a chimney through a floor, wall or roof made of combustible
material. See table 3 and figure 1.
DIS
Inside diameter (A) Roof / Floor (C) Wall (C)
Ø5” to Ø10” Inside Ø + 8” Inside Ø + 8”
Ø12” to Ø36” Inside Ø + 8” Not Listed
Table 3 - Minimum openings
DAS
Inside diameter (A) Roof / Floor (C) 1400°F Chimney (C)
Ø5” to Ø10” Inside Ø + 12” Inside Ø + 12”
Ø12” to Ø36” Inside Ø + 12” Not listed
Table 4 - Minimum openings
Chimney outside diameter
Chimney inside diameter
2” Insulation
Clearance opening
B = A + 4”
OPENINGS - Minimum open-
A
B
C
ing required when installing
a chimney through a floor,
wall or roof made of combustible material.
Figure 1
DIS
Minimum air space clearance to combustible construction to model
DIS Chimney is 1”.
For non-combustible construction, maintain clearances as required
for installation, access for inspection or per local code.
Inside diameter B.H.A Chimney 1400°F Chimney Grease Duct
Ø5” to Ø36” 1” 1” 2”
Table 1 - Minimum air space clearance to combustible construction model DIS
DAS
Minimum air space clearance to combustible construction to DAS
chimney is 4”.
Inside diameter B.H.A Chimney 1400°F Chimney
Ø5” to Ø36” 4” 4”
Table 2
4
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
WARNINGS
DO NOT INSTALL ANY TYPE OF INSULATION IN THE
REQUIRED CLEARANCE SPACES SURROUNDING
THE CHIMNEY.
CHIMNEY AND FITTING JOINT ASSEMBLY
All components have a male and female end. The installation orientation
is indicated on the labeling of each chimney section with an arrow. The
arrow indicates the direction of the flow. Clean all inner and outer surfaces
of the male and female ends with an appropriate organic solvent, such
as acetone, Mek, or other commercial degreaser.
1. Apply a bead of S-650 sealant about 1/8” thick around the male end
of chimney and for Grease duct application, add a bead of S-2000
sealant at the edge of the female chimney (see figure 2). See table
5 for approved sealants.
2. Insert the female end, of another section of chimney, over male end
with sealant (see figure 3).
3. Insert the assembly band (see figure 4) around the joint of the two
sections assembled in step 2. A small bead of S-650 can be applied
on the inner groove of the band prior to installation for better leak
tightness.
4. Using a phillips screwdriver, connect the two ends of the band as
shown in figure 5.
5. Where the chimney is installed outside, an exterior sealant S-375
must be applied at the upper joint of the band and the outer casing,
see figure 5.
Figure 4
Apply S-375 sealant here
for exterior installation
Grease Duct Application: Add a bead of S-2000 sealant
at the edge of the female end.
Figure 2
Add S-650 sealant here
Figure 5
SEALANT USAGE
Interior Installation
Sealant Application Supplier Model Color Max. Temp.
Joints Duravent S-650 red 650°F
Inner Flue Duravent S-2000 White 2000°F
Exterior Installation
Sealant Application Supplier Model Color Max. Temp.
Joints Duravent S-650 red 650°F
Outer Band Duravent S-375 gray 375°F
Table 5
CAUTIONS
A. DO NOT ALLOW SCREWS TO PENETRATE THE INNER FLUE.
THIS CAN CAUSE CORROSION, GAS LEAKAGE OR EXPANSION
FAILURE.
B. NEVER USE SCREWS THROUGH THE OUTER CASING OF AN
ADJUSTABLE LENGTH OR EXPANSION JOINT.
Figure 3
C. OBSERVE ADEQUATE SAFETY MEASURES WHEN USING A
DEGREASER.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
5
SUPPORT METHODS AND HEIGHT LIMITS
1. Several support and guiding methods are used to anchor a chimney
against upward, downward and angular displacement.
2. These supports and guides used with thermal expansion devices,
prevent bending stresses on the chimney elbows and joints.
3. Supports and guiding methods and installation are described in Section C. Certain limitations apply for proper installation of supports
and guides. See tables 6 and 7.
MAXIMUM CHIMNEY HEIGHTS AND SUPPORT METHOD FOR MODEL DIS AND DAS
Anchor
Inside
Diameter
(in)
DIS/DAS
5
6
8
10
12
14
16
18
20
22
24
26
28
30
32
34
36
Anchor Plate
Plate
with Length
(AP)
Metal Frame Only
DIS DAS
200 200
147
128
200 200
200 200
103
177 200
86
73
152 194
64
133 175
57
118 146
106 135
53
97 125
48
44
89 117
76 92
37
35
71 88
33
66 83
63 76
31
59 73
29
56 70
27
53 65
26
(APL)
Ventilated
Anchor Plate
(APV)
Metal Frame
OR Wood
Frame
DIS/DAS DIS/DAS
133 147
116 128
93 106
78 86
66 73
58 64
52 57
48 53
43 48
40 44
34 37
32 35
30 33
28 31
26 29
25 27
23 26
Wall Support (WS)
Frame
Metal
Wood
Frame
DIS/DAS
61 105
53
43
35
30
27
24
22
20
18
15
14
13
13
12
11
11
Tee
(T)
92
74
61
53
46
41
38
34
31
27
25
23
22
21
20
18
Table 6 - Dimensions are in feet
See Dim. “H” figure 7
and Chimney Guying
and Bracing in this
section.
“ M V S” d imen sion see table 7 for
Maximum Vertical
Spacing between two
guides or a support
and a guide.
NOTE: W h en t he
maximum height from
table 6 is exceeded, resupport using another
support and expansion
joint.
Maximum
height - See
table 6
MVS
MVS
MVS
Termination
Storm collar (SC)
Roof support (RS)
Wall guide (WG)
Floor guide (FG)
SUPPORT AND GUIDE SPACING FOR MODEL DIS AND DAS
Inside
Diameter (in)
5 10 8 10 12
6 10 8 10 12
8 10 8 10 12
10 10 8 10 12
12 10 8 10 12
14 10 8 10 12
16 10 8 10 12
18 10 8 10 12
20 10 8 10 12
22 10 8 10 12
24 10 8 10 12
26 10 8 10 12
28 10 8 10 12
30 10 8 10 12
32 10 8 10 12
34 10 8 10 12
36 10 8 10 12
Table 7
- Dimensions are in feet
MVS*
Interior Exterior
H** MHS***
* MVS = Maximum Vertical Spacing between two guides or a support and
a guide in a vertical position.
** H = Maximum freestanding Height above the roof.
*** MHS = Maximum Horizontal Spacing between two guides or a support
and a guide is 12 feet.
THERMAL EXPANSION
Good installation practice requires that any length of exhaust system
between two fixed points subject to more than 1/4 inch expansion must
have an Adjustable Length (LA) or Bellows Joint (LB) to compensate
for expansion. Models DIS and DAS will expand approximately 1 inch
for every 100°F temperature rise per 100 feet of chimney. To accommodate chimney movements, any wall guide or floor guide must be
located away from the locking band.
It is essential that these parts be properly installed and provided with
adequate support and guidance to prevent binding or excessive bending forces. (See detailed installation information contained on page 19,
Thermal Expansion).
Figure 6 - Maximum chimney heights and support
6
Wall support (WS)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
CHIMNEY WEIGHT
Chimney weight is given in pounds per foot of chimney for each diameter.
It is important to know the weight of the chimney section for chimney
support or guiding. Chimney weight (table 8) along with maximum
chimney height (table 6) are necessary to calculate the proper anchor
strength needed with wall supports (WS), Anchor Plate (AP) supports
and Suspension Bands (SB).
CHIMNEY WEIGHT IN LB/FT
Inside diameter Model DIS Model DAS
5 7 4
6 8 5
8 10 6
10 12 8
12 14 9
14 16 10
16 18 12
18 20 13
20 22 14
22 24 15
24 28 19
26 30 20
28 32 21
30 34 23
32 36 24
34 38 25
36 40 27
Table 8
Example: Model DIS, 6” diameter section of 25 feet in length from table 8,
weight in lb/ft = 8. Total weight 8 x 25 = 200 lbs
CHIMNEY GUYING AND BRACING
* If Dimension “H” exceeds the
value in table 7, use bracing or
cable guying to stabilize chimney section above the roof. See
notes 3, 4, 5 and figure 8.
Guide
Support
No guying or bracing required
Figure 7 - Maximum freestanding chimney height
See table 7 for “H” dimensions
Guy Cable * tensioners and
roof anchors * (by others)
H*
Maximum Height
See table
H
Brace
H
5’ MAX
1. Proper guying and bracing is essential for part of the chimney that
extends above the roof or parapet wall. The chimney at this point is
subject to wind conditions and needs special attention for proper
stabilization.
2. If the stack above the roof does not exceed dimension H, no special
guying or bracing is required. However, to protect the flashing from
lateral movement, a guide must be installed at the roof level. See figure
7).
3. For stack height above the roof that needs guying or bracing, a support,
a small length and a expansion length must be installed near the roof
level to absorb the thermal expansion and minimise this effect on the
guy wires or brace.
4. When using guy wire, the cable must be slightly slack or loose to allow
thermal expansion.
5. When using rigid bracing, the maximum vertical height between supports must be reduced to 5’ to compensate thermal expansion.
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Support
* Cables and roof anchors
designed for 30 lb. per
sq. ft. force on chimney
projected area.
Expansion Length
Guide
See table 6
Support
Figure 8 - Chimney height with rigid bracing or guying option
Maximum
height -
7
TERMINATION HEIGHT
MULTI-ENGINE EXHAUST SYSTEMS
Chimneys and vents shall terminate above the roof level in accordance
with the following requirements:
1. Five feet above the roof level or any adjacent flat roof, wall parapet
or air intakes, and/or in accordance with the following NFPA 211
requirements.
2. Where chimney terminates at less than 10 feet from any adjacent
ridge, wall or parapet, the chimney shall terminate at minimum of 3
feet above the ridge, wall, or parapet.
3. Where chimney terminates at more than 10 feet from ridge, wall, or
parapet, a minimum height of 2 feet shall be required above the ridge
wall or parapet.
A common exhaust system for multiple engine or turbine installations
is generally not recommended. A separate exhaust system should be
provided for each engine or turbine.
Check with your engine or turbine manufacturer prior to common exhaust system design. Exhaust gas from operating units tends to flow to
non-operating units where condensation may form. WATER IN ENGINE
OR TURBINES AT START-UP MAY CAUSE DAMAGE. IN GENERAL,
A SEPARATE EXHAUST SYSTEM SHOULD BE PROVIDED FOR EACH
ENGINE OR TURBINE.
8
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
SECTION B - TEES, ELBOWS, INCREASERS
90° TEE (T90)
1. Generally used to connect the horizontal length from the appliance to the
vertical length when clean-outs access or drain is required.
2. 90° should not be used for changing flow direction in diesel or turbine
exhaust.
3. For supporting the tee, the preferred location is above the tee (see figure
9).
4. If it is not possible to suspend the tee, it may be supported from the
base (see figure 10). When this is necessary, a short length should be
installed between the tee and the tee cap or Drain-Tee Cap for a good
clean-out or inspection access.
IMPORTANT NOTE:
If more than 1/4” of thermal expansion is expected between a stationary
point and the tee, the use of an expansion length and a two axis support
is recommended to minimize bending moments on the tee (see figure 11
and table 9).
Gas Temperature Rise Maximum Length Expansion
200°F 12’0” 0.25”
300°F 8’0” 0.25”
400°F 6’0” 0.25”
500°F 5’0” 0.25”
600°F 4’0” 0.25”
700°F 3’6” 0.25”
800°F 3’0” 0.25”
900°F 2’6” 0.25”
1000°F 2’0” 0.25”
Note: 60°F - 70°F ambient T°
Table 9 - Maximum allowable length between two fixed points
without expansion length
Lengths
45° TEE (T45)
1. For systems where flow resistance must be minimized like engine or
turbine exhaust. The use of a 45° tee is suggested. It can be combined
with a 45° elbow to make a smooth 90° turn (see figure 12). To support
this tee, use similar method as a 90° tee.
2. When using 45° tee to connect multiple appliances together, thermal
expansion must be considered. Thus prepared to prevent bending moments on the tee, an expansion length must be installed between the tees
(see figure 13).
45° TEE Y (TY)
1. This kind of tee is useful where the stack is located between two application or with a double exhaust system. Use the same support method and
thermal expansion considerations from the other tees (see figure 14).
Figure 12 - Smooth 90° Turn
Stationary / Fix
Support
45° Tee
Expansion
Length
Increaser
Wall
Support
Tee
Tee Cap or
Drain-Tee Cap
Figure 9 - Suspended Tee
Stationary
Support
Suspension
Figure 11 - Two Axis Support
Tee
Wall Support
Short Length
Tee Cap or
Drain-Tee Cap
Figure 10 - Base Supported Tee
Expansion
Band
expansion between two stationary points
Length
Stationary
Support
More than 1/4” of expected thermal
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Appliance Appliance
Appliance
Figure 13 - Multiple appliance connection with 45° tees
45° Tee Y
45° Elbow
Increaser
Expansion
Length
Appliance
Figure 14 - 45° Tee Y
9
TEE CAP (TC)
ELBOWS
1. Use to block one of the openings of horizontal or vertical tee.
2. Removable, it facilitates access for inspection and maintenance of
the chimney.
3. The installation is the same as for lengths.
4. When removed, the old silicone must be cleaned out and a new bed
of sealant must be applied.
DRAIN-TEE CAP (DTC)
1. Use as a drain for vertical stack.
2. Connect to a suitable drain fitting to allow rain entering the chimney
to wash down, dilute and remove any corrosive residue.
3. Same installation as a tee cap.
Tee cap
Drain-Tee Cap
Figure 15 - Tee cap and Drain-Tee Cap
INCREASER, STEP OR TAPERED
1. Use to increase the diameter of the chimney flue.
2. The tapered increaser induce less pressure drop than the step increaser, but requires more space. It has a 15° side angle and provides
increases of one, two or three size. The height of the fitting varies
depending on the diameters to be increased (see figure 17).
3. The tapered increaser have the same load strength as a standard
length, but the step increaser is a non-structural part and must be
protected from axial and lateral load.
1. Elbows are used for changes in direction in horizontal or vertical
portions of a chimney system.
2. All elbows feature the standard joint assembly as described in Section
A - Chimney and Fitting Assembly.
3. Elbows are used in combination to make different angles ranging
from 3° to 90° in horizontal and vertical breechings of the chimney
system.
4. Elbows are not designed to take bending loads and must be structurally
supported (see figure 17). Structural parts such as posts or beams
may also be needed to hold chimney supports in position.
2X 45° Elbows
Anchor plate (A P) and
frame (by others)
Wall support (WS)
Expansion length
Ø B
2”
C*
2”
Ø A
* See table 10
6”
Figure 16 - Increaser height
STEP 1 Diameter 2 Diameters 3 Diameters
C 4” 8” 12”
Table 10 - Tapered increaser height
Ø B
Figure 17 - Supported elbow
Ø A
10
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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