DuraVent DURASTACK PRO DAS1 Series User manual

M&GDURAVENT
S UBMITTAL R ECORD |  DAS1,  DIS1,  DIS2,  DIS4,  DCL J ANUARY 2016

DURASTACK™PRO
P OSITIVE P RESSURE S YSTEMS 
M
ODELS 
DAS1
 –  1 INCHAIRINSULATED 
DIS1
 –  1 INCHCERAMICFIBERINSULATED 
DIS2
 –  2 INCHCERAMICFIBERINSULATED 
DIS4
 –  4 INCHCERAMICFIBERINSULATED 
DCL
 – SINGLEWALL 

MATERIAL  SELECTION
FLUE  (INNER  WALL)CASING  (OUTER  WALL)
304304
316441

GALVALUME

PROJECT:
PREPAREDBY:
PREPAREDFOR:





BoilerBreechingandStack
Generator|EngineExhaust
FumeVenting
FireplaceVenting

1SUBMITTALRECORDFORDURASTACKMODELSDCL,DAS1,DIS1,DIS2ANDDIS4
M&GDURAVENT|10JUPITERLANE|ALBANY,NEWYORK
www.duravent.com

DURASTACK™PRO 

MODELS D CL, DAS1, DIS1, DIS2, DIS4


DCL- SINGLE WALL
DAS1- AIR INSULA TED
DIS1, DIS2, DIS4 – FIBER INSULATED
SECTION A - CODE C OMPLIANCE
UNDERWRITERS LABORATORIES LISTINGS
DURAVENT single wall Model DCL and double wall models DAS1 , DIS1, DIS2 and DIS4
venting systems are listed by Underwriters Laboratories, Inc. (UL) in the following
product categories and in
the diameters indicated:
Model DAS-PRO (DAS1 - Doublewall, 1” air insulation)
Building Heating Appliance Chimney 5”- 36” ID
1400° Fahrenheit Chimney 5”- 36” ID
Models D I S - PRO (Doublewall, DIS1, DIS2 or DIS4) where the number
equals ceramic fiber insulation thickness
Building Heating Appliance Chimney 5”- 36” ID
1400° Fahrenheit Chimney 5”- 36” ID
Building Heating Appliance Chimney(Type HT) 5”- 36” ID
APPLICA TION
UL 103 Building Heating Appliance Chimney
Listing:
Under this category, models DAS-PRO and DI S -PRO have been determined suitable
for
venting flue gases at temperatures not exceeding 538°C (1000°F) under
continuous
opera ting conditions from gas, liquid, oil or solid fuel fired appliances. Also
complies with opera
tion (less than one hour) at temperatures not exceeding 740°C
(1400°F) and brief
opera tion (maximum 10 minutes) at temperatures not exceeding
906°C (1700°F).
Building Hea ting Appliance Chimneys are suitable for use with
Building Heating Appliances and Low
Hea t Appliances as described in the Chimney
Selection Chart
of National Fire Protection Association (NFPA) Standard NO. 211.
Building Heating Appliance Chimney (Type HT) Listing 5” to 24” DIS-PRO
ONLY
Under this category (UL 103HT), the 5” through 24” ID DIS-PRO Models have qualified
for
UL ’ s additional, optional “Type HT” rating (for Building Heating Appliance
Chimneys) which
indicates they have been evaluated and found suitable for exposure
to 2100°F flue gases
for a 10 minute duration at a specific clearance for each
Model and diameter. Many local, state and regional code authorities require a
“Type HT” rating for chimneys for certain appliance venting applications; especially
solid fuel.
Building Heating Appliance Chimneys are suitable for use with Building Hea ting
Appliances and other Low Heat Appliances as described in the Chimney Selection
Chart
of National Fire Protection Association (NFPA) Standard No. 211.
1400°F Chimney Listing - Under this category (UL 2561,ULC-C959), Model D A S -
PRO
and DIS X-PRO have been determined suitable for venting flue gases continuously
at a tempera
ture not exceeding 1400°F, and a 10 minute intermittent service at
temperatures not
exceeding 1800°F. As such, Model DAS-PRO and D I S -PRO
Models are suitable
for use with ovens and furnaces as described in the Chimney
Selection Chart
of NFPA No. 211, in addition to other A pplications.
Engine Exhaust
Based upon the above referenced UL Listings and supplemental, UL confirmed
pressure
testing, Model D A S -PRO and D I S -PRO are also suitable for use as
complete exhaust systems for
diesel engine and gas turbines. When Model DAS-PRO
and DIS-PRO
is used as an engine or turbine exhaust it is intended to be installed in
accordance with
NFPA 37 “Stationary Combustion Engines and Gas Turbines”. This
code states, “When such (flue gas) temperatures do
not exceed 1000°F (538°C)
except
for infrequent, brief periods, the engines shall be classified as low heat
appliances”. For continuous operation over 1000°F and not exceeding 1400°F the
exhaust system should be installed as a 1400°F
Chimney .
Models D I S -PRO
may be used to meet various needs,such as:
a) Reduce outer pipe surface tempera ture.
b) Reduce building heat gain by retaining energy inside the vent.
c) Increase the efficiency of energy recovery systems by reducing exhaust
gas temperature losses.
d) Increase chimney or exhaust system draft loss performance due to
reduced exhaust gas temperature drop.
e) Reducebuilding noise levels caused by high speed or pulsating exhaust
induced noise. NOTE: Specific tests have not been conducted to measure
acoustic performance.
Models DAS-PRO and D I S -PRO exhaust systems are intended for use in connecting
the
hea ting appliance, engine, or turbine to the outdoors, while operating under
positive forced draft,
negative induced draft or neutral gravity flow internal
pressure conditions. Models DAS-PRO
and DIS-PRO (all insulation thicknesses)
may be intermixed
in the same chimney system, assuming the proper associated
airspace clearances-to-combustibles are maintained.
ADDITIONAL
APPLICA TIONS
Models D CL, DAS1 and DIS-PRO are also suitable for negative, neutral or positive
pressure
pre- fabricated piping systems intended for use in a variety of
applications including but not
limited to the following: Fume Venting, Chutes,
Particle Conveying, Dr
yer Vents and Ventilation Ducts.
SUITABLE FOR POSITIVE PRESSURE VENTING APPLICATIONS WITH MAXIMUM 60”
WATER COLUMN INTERNAL STATIC PRESSURE AT 1000 DEGREES F .
MULTI-ENGINE
EXHAUSTS
A common exhaust system for multiple engine or turbine installations is generally not
recommended. Check with your engine or turbine manufacturer prior to
common
exhaust system design. Exhaust gas from operating units tends to flow to non-
opera
ting 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
.

2SUBMITTALRECORDFORDURASTACKMODELSDCL,DAS1,DIS1,DIS2ANDDIS4
M&GDURAVENT|10JUPITERLANE|ALBANY,NEWYORK
www.duravent.com

SECTION B - GENERAL INFORMA TION
PART NUMBERS
These instructions identify major model parts by name and part number .
Example:
DIS1 -36” length with inside diameter 14” made of 316SS flue (inner w a l l ) and
304SS
( outer casing).
DIS1 14 L36 BC
Model Dia. Part Ma terial Type
DAS1 - 30° elbow with inside diameter 22” made of 30SS flue (inner wall)
and
galvalume (outer casing).
DAS1 22 E30 CE
Model Dia. Part Ma terial Type
DCL - single wall support for 8” diameter grease duct made of galvalume.
DCL 8 WS E
Model Dia Part Ma terial Type
Use only factory-supplied components. Failure to do so will void the
certification and the warranty of the grease duct
system.
EFFECTIVE LENGTH
Theeffective length is the length of the part when it is assembled.
Effective length
L36 ................36 1/16”
L24 ................24 1/16”
L18 ................17 9/16”
L12 ................11 9/16”
CLEARANCE
DuraVent Models DCL, DAS-PRO and DIS-PRO are primarily intended to be
used in
a non-combustible surrounding. Only Models DAS-PRO and DIS-PRO can
be used for
either combustible or non-combustible surroundings. When installed
in an open room where enclosure
is not required, the chimney may be located
at a minimum
clearance to adjacent combustible walls in accordance with Table
1. The chimney may be located in corners formed by two combustible
constructions
(walls, floor, ceiling, supports, etc.)
NOTE: The clearance distance with the wall is the distance between the wall and
the inner V-Band for model DCL or the Outer Band (BSE) for model DAS-PRO and
DIS-PRO. See
Table 1 for the clearance distance.
F or non- combustible construction, maintain clearance as required for installation
access for inspection or per local code. In buildings more than one story in height
and in one-stor y 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 not less than 2 hours.
DuraVent models DAS-PRO and D I S -PRO chimneys may penetrate a combustible
floor, wall, or roof using the appropriate parts and openings sizes. See Section D
“Roof and Wall Penetration” for more details.
NOTE: Do not enclose with combustible materials
In the case of a fire rated enclosure made of non-combustible or limited
com bustible construction, the minimum clearance with the Model D CL must
be
6” or as required by local code.
TABLE 1
–
Minimum Air Space CLEARANCE to
Unenclosed Combustible Surroundings
(adjacent to maximum of two [2] walls)
Vent Model Flue Diameter Ø
(in)
Clearance to
Combustible
(in)
Clearance to
Non-
Combustible
(in)
DCL 5 to 36 18 0
DAS1
5 and 6 4 0
7 to 14 5 0
16 to 22 6 0
24 to 30 7 0
32 to 36 8 0
DIS1
(UL103 Type HT
5” to 24” only)
5 and 6 1 0
7 to 14 2 0
16 to 22 3 0
24 to 30 4 0
32 to 36 5 0
DIS2 &
DIS4
(UL103 Type HT
5” to 24” only)
5 to 14 1 0
16 to 30 2 0
32 to 36 3 0
Dimensions are in inches
OPENINGTHROUGHCONSTRUCTION 
The following table serves to identify the minimum opening required
when installing a chimney through a floor, wall or roof made of
combustible ma
terial. See Table 2.
TABLE 2 - Openings in Floor / Wall / Roof
–
for ALL
MODELS
Vent
Model
Flue
Diameter
Ø
(in)
Combustible
Roof, Floor
or Wall
(in)
Non-Combustible
Roof / Floor / Wall
(in)
Installed Stacks
(locking Bands
Installed)
Uninstalled
Stacks ( NO
locking Bands
Installed)
DCL 5 to 36 ID + 37 – ¼” ID + 2 – ½” ID + 1 – 1/8”
DAS1
5 and 6 ID + 10 – ¾” ID + 4 – ½”
ID + 2 – ¾”
7 to 9 ID + 12 – ¾”
10 to 14
ID + 3 – ½”
16 to 22 ID + 14 – ¾”
24 to 30 ID + 16 – ¾”
32 to 36 ID + 18 – ¾”
DIS1
5 and 6 ID + 4 – ¾” ID + 4 – ½”
ID + 2 – ¾”
7 to 9 ID + 6 – ¾”
10 to 14
ID + 3 – ½”
16 to 22 ID + 8 – ¾”
24 to 30 ID + 10 – ¾”
32 to 36 ID + 12 – ¾”
DIS2
5 to 7 ID + 6 – ¾” ID + 6 – ½”
ID + 4 – ¾”
8 to 14 ID + 5 – ½”
16 to 30 ID + 8 – ¾”
32 to 36 ID + 10 – ¾”
DIS4
5 to 7 ID + 10 – ¾” ID + 10 – ½”
ID + 8 – ¾”
8 to 14 ID + 9 – ½”
16 to 30 ID + 12 – ¾”
32 to 36 ID + 14 – ¾”
Dimensions are in inches
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3SUBMITTALRECORDFORDURASTACKMODELSDCL,DAS1,DIS1,DIS2ANDDIS4
M&GDURAVENT|10JUPITERLANE|ALBANY,NEWYORK
www.duravent.com

PRODUCT WEIGHTS
The averageweight of the duct, per foot of length, can be estimated using the
following formula:
DCL 0.40 X Diameter in
inches = lbs per foot
DAS1 0.79 X Diameter in
inches
= lbs per foot
DIS1 0.93 X
Diameter in
inches
= lbs per foot
DIS2 1.09 X
Diameter in
inches
= lbs per foot
DIS4 1.44 X
Diameter in
inches
= lbs per foot
Chimney design should provide adequate support
to ensure components are not
overloaded.
THERMAL EXPANSION CALCULA TIONS
Thermal expansion under normal operating temperatures can fatigue welds
causing leakage.It is necessary to calculate the thermal expansion between two
fixed points.
F ormula: [Length (ft) / 100] x [Temperature Rise degrees F / 100]
Example : [50’ / 100] x [75°F / 100] = 0.375” Expansion
If the computed expansions between the fixed points are greater than 0.375 ” -
DuraVent recommends an adjustable or bellow length be installed.
SUPPORT METHODS AND HEIGHT LIMITS
1.
Several support and guiding methods are used to anchor a chimney
a gainst 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 E-SUPPORTS . Certain limitations apply for proper
installation of supports
and guides. See Tables 3, 4 and 5 and
Figures showing MVS and H.
4.
It is recommended to apply an exterior grade high heat paint to any
pla
te supports, full/half angle rings, wall supports/guides,
aluminized outer
maximum corrosion protection against the elements.
(Ex:
Rust-Oleum V200 series High Heat Industrial Aerosol)
NOTE: All the weight of the section is supported by the inner flue.
Never
support any chimney pipe from the outer casing.
TABLE3
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HeightLimitsforeachTypeofSupport
Parts
Flue
DiameterØ
(in)
HEIGHT(ft)
DCLDAS1DIS1DIS2DIS4
AnchorPlate5to22264 13311497 73
24to36161 827059 45
AnchorPlate
withLength
5to22281 142121103 78
24to36172 877463 48
BaseSupported
Tee
5to22102 524437 28
24to3663322723 17
WallSupport5to22105 534539 29
24to3664322824 18
WARNINGDonotattachanysupportstocombustible
Dimensions are in inches (diameter) and feet (distance)
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4SUBMITTALRECORDFORDURASTACKMODELSDCL,DAS1,DIS1,DIS2ANDDIS4
M&GDURAVENT|10JUPITERLANE|ALBANY,NEWYORK
www.duravent.com

TABLE 4 Maximum Vertical Spacing between ANY Guide / Supports and
Maximum Freestanding above the Roof
MODEL
DCL DAS1 / DIS1 DIS2 DIS4
HEIGHT (ft) HEIGHT (ft) HEIGHT (ft) HEIGHT (ft)
Flue
Diameter
Ø(in) MVS* H* MVS* H* MVS* H* MVS* H*
5 20 8' 6" 20 7' 3" 20 6' 6" 20 5' 9"
6 20 9' 6" 20 8' 3" 20 7' 6" 20 6' 9"
7 20 10' 20 8' 9" 20 8' 3" 20 7'
8 20 10' 9" 20 9' 20 8' 6" 20 7' 3"
9 20 11' 6" 20 9' 3" 20 8' 9" 20 7' 6"
10 20 12' 20 9' 6" 20 9' 20 7' 9"
11 20 12' 6" 20 9'9" 20 9' 3" 20 8'
12 20 13' 20 10' 20 9' 6" 20 8' 3"
13 20 13' 6" 20 10' 3" 20 9' 9" 20 8' 6"
14 20 14' 20 10' 6" 20 10' 20 9'
16 20 14' 6" 20 11' 20 10' 6" 20 9' 6"
18 20 15' 20 11' 6" 20 11' 20 10'
20 20 15' 20 12' 20 11' 6" 20 10' 9"
22 20 15' 20 12' 3" 20 11' 9" 20 11'
24 20 15' 20 12' 9" 20 12' 3" 20 11' 6"
26 20 15' 20 13' 20 12' 6" 20 12'
28 20 15' 20 13' 6" 20 13' 20 12' 3"
30 20 15' 20 13' 9" 20 13' 6" 20 12' 9"
32 20 15' 20 14' 3" 20 13' 9" 20 13' 3"
34 20 15' 20 14' 6" 20 14' 3" 20 13' 6"
36 20 15' 20 15' 20 14' 6" 20 13' 9"
MVS* Maximum Vertical Spacing between two (2) Guides or Support
and Guide in a Vertical Position
H** Maximum Freestanding Height above the roof.
This limited height is due to wind loads.
Dimensions are in inches (diameter) and feet (distance)
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TABLE5
–
maximumHorizontalSpacingbetweeneachGuide/Support
Product
Flue
Diameter
Ø(in)
Distance(ft)
DCLDAS1DIS1DIS2DIS4

HalfAngleRing
(HAR)/
FullAngleRing
(FAR)/
AnchorSupport
(AP)/
AnchorPlatewith
Length(APL)/
HeavyDutyWall
Guide(HDWG)

5to122323191612
14to241919161410
26to36151513118
Dimensions are in inches (diameter) and feet (distance)
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EXTERIOR CORROSION PROTECTION
It is recommended to apply an exterior grade high heat paint to any
plate supports, full/half angle rings, wall guides, aluminized outer
walls for corrosion protection against the elements.
EX: Rust-Oleum V200 series High Heat Industrial Aerosol
SEISMIC REQUIREMENTS
In certain areas of the country, local codes contain requirements to
address seismic risks. Seismic requirements for chimneys and
grease ducts usually include specifications for additional “sway bars” /
bracing, or similar devices in order to help stabilize the system in the
event of an earthquake.
Specific guidelines (including spacing, location, size and method of
attachment of bracing / sway bars or other devices for addressing
seismic requirements vary depending upon the adopted code,
seismic zone, duct size, location in building, etc. and are not within
the scope of this document.
Consult with a design professional in order to determine compliance
options for these potentially complex requirements when this product
is to be installed in a building where these additional requirements
apply.
The support methods described in this document have been proven
adequate (via UL certification) for locations where there are no
additional seismic zone requirements. In order to address additional
seismic requirements they may be further supplemented with a
variety of generic sway bars or braces that attach to or around the
outer wall of the chimney / grease duct system. Full Angle Rings
(FAR) and Half Angle Rings (HAR) may be included as components
of such supplemental bracing.
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5S
UBMITTAL R ECORDFOR D URA S TACK M ODELS DCL,  DAS1,  DIS1,  DIS2 AND DIS4
M&G
 D URA V ENT |  10  J UPITER L ANE |  A LBANY ,  N EW Y ORK 
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SECTION C - PIPE & FITTING JOINT ASSEMB L Y
The ends of each inner pipe are made of flanges. All the joints between sections are
flange-to-flange of the inner pipe.
CAUTION: SHARP SHEET METAL, RISK OF CUTS WITH SLEEVES AND
SECTIONS.
All sections have an unattached alignment sleeve (See figure 5).
The alignment sleeve facilitates alignment of
adjacent sections and
provides a backing for the sealant applied to flange face keeping it in the intended
location. It may either be placed on the outlet end section or in the
downstream section. It is
not a required part, which means that it might not be used
at all
.
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Figure 5 – Feature Alignment Sleeve
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SEALANT USAGE
Part No. S-650 – (Permatex® Red High Temp Silicone) is red and is
one of our UL approved sealants for temperatures up to 650°F. Can
be used for V-Channel Bands and for weathering/sealing where
necessary.
Part No. S-2000 – A high temperature pre-mixed sealant for flue gas
temperature up to 2000°F. S-2000 is water soluble and should not be
used where exposed to weather
Part No. S-375 – (Nuflex 302 General Purpose) is a low temperature
grey silicone (450°F) only for weathering/sealing on outdoor seams
and Outer Band (BSE) where necessary.
STEP 1
Apply a continuous bead of S-650 or S-2000 sealant in the V-Clamp
grove of the locking band.
NOTE: Sealant is supplied by DuraVent - individual tubes are marked
S-650 or S-2000 . See TABLE 6 for number of tubes per joint.
CAUTION: THE USE OF ANY OTHER SEALANT IS NOT RECOMMENDED, MA Y VOID
CERTIFICATION AND MAY IMPAIR THE SEALING EFFECTIVENESS.
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Figure6‐JointAssemblyStep 1 
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STEP 2
Apply a continuous bead of S-650 or S-2000 sealant ¼” wide to one
of the flanges to be joined.
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Figure7–JointAssemblyStep2
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STEP 3
Join the two flanged ends of the duct section together and rotate
slightly to ensure complete coverage of sealant on flanges
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Figure 8 – Joint Assembly Step 3
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STEP 4
Install the V-Band around the flanges making sure the flanges are
located within the V-clamp
NOTE: Do not locate V-Band hardware at the bottom side of the
horizontal duct joints
NOTE 1: Light tapping with a hammer all around the band while
tightening bolts helps align and pull flanges together
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Figure 9 – Joint Assembly Step 4
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Removable
Alignmentsleeve

6S
UBMITTAL R ECORDFOR D URA S TACK M ODELS DCL,  DAS1,  DIS1,  DIS2 AND DIS4
M&G
 D URA V ENT |  10  J UPITER L ANE |  A LBANY ,  N EW Y ORK 
www.duravent.com

STEP 5 (DIS1, DIS2, DIS4 - ONLY)
Install the supplied insulation strips between the sections to ensure
that all air gaps are filled. Be sure that insulation is tightly packed and
completely fills the void between flue and closure band when
assembled.
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Figure 10 – Joint Assembly Step 5
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STEP 6
Secure the Outer Casing Band with the Outer Band (BSE).
Joint installation is now completed.
NOTE: For exterior installations it is recommended to seal the band
with S-375 sealant to prevent water from entering.
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Figure 11 – Joint Assembly Step 6
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TABLE6‐Expectednumberof Tubes of
S‐2000orS‐650perJoint
Assembly 
Flue
Diameter Ø
(in) 
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Numberof
tube
per Joint 
51/5
61/5
71/5
81/5
91/5
10 1/5
11 1/4
12 1/4
131/4
141/4
161/4
181/3
201/3
221/3
241/2
261/2
281/2
302/3
322/3
342/3
362/3
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7SUBMITTALRECORDFORDURASTACKMODELSDCL,DAS1,DIS1,DIS2ANDDIS4
M&GDURAVENT|10JUPITERLANE|ALBANY,NEWYORK
www.duravent.com

SECTION D-COMPONENTS
HIGH PRESSURE SYSTEM – up to 60” WC
THERMAL EXPANSION JOINT and ODD LENGTH
For Thermal Expansion we recommend using a Bellow Length (LB).
For ODD Length we recommend using a Variable Length (LV).
LOW PRESSURE SYSTEM – up to 6” WC
THERMAL EXPANSION and ODD LENGTH
For thermal Expansion and ODD Length we recommend using
an Adjustable Length (LA).
THERMAL EXP ANSION
The inner pipe of Model DAS-PRO and DIS-PRO is load bearing and its thermal
expansion is the same as that of a continuous pipe. A simplified rule for exhaust
pipe expansion estimation is tha
t the axial growth will be approx. 1” per 100’ of
pipe length for each 100°F the flue gas temperature is above the surrounding air
tempera
ture.
See Thermal Expansion Formula on page 3.
When assembled in any orientation, the amount of thermal expansion of the inner
pipe is directly dependent on the inner wall temperature and the length of pipe
between fixed points. Good installation practice requires that expansion greater
than
1/4 inch will be compensated for using a Bellows Joint or Adjustable Length,
depending on
the maximum pressure encountered.
The flanged inner piping joints have negligible flexing capacity, and in addition, tees
and elbows are not designed to withstand bending moment forces. Because the
amount of outer casing axial movement is
the same as inner casing movement, the
outer jackets of piping must slide to avoid excessive forces on Tees, Elbows of fixed
points. To accommodate outer casing movements, external guides along walls at
floors or in lateral breechings must allow for movement of pipe.
BELLOWS LENGTH
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For exhaust pressure to 60 inches of water column, Bellows are recommended
for expansion and vibrational movements of the piping.
The Bellows has a 0.035” thick or heavier straight stainless steel liner to
protect the thinner spring material from heat and flow effects. It is used anywhere in
a system for axial and vibrational movements only and must be accurately
supported and guided. This part
has limited lateral movement (1/8” max.) and
lateral offsets and parallel misalignments
should be eliminated. The purpose of the
liner is to minimize contact, smooth
flow, control erosion and eliminate resonance
caused by exhaust gases passing through the bello
ws. See Table 7 for Bellows
Properties
Typical Bellow design
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ADJUSTABLE LENGTH (LA) - EXPANSION JOINT
The LA has two functions. It is used to compensate for thermal expansion and
make up odd lengths of vent.
.
It is shipped with graphite band assembly preassembled on the sliding inner pipe.
The LA is adjustable from 7 1/4 to 28 3/8 inch. See Figure 15
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Figure15–AdjustableLength(LA)
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GasFlowCuttablehalfsiding
outercasing
Moveable
gasket
assembly
Cuttablesliding
innerwall
SpacingTool
supplied
Wrench–by
others

8S
UBMITTAL R ECORDFOR D URA S TACK M ODELS DCL,  DAS1,  DIS1,  DIS2 AND DIS4
M&G
 D URA V ENT |  10  J UPITER L ANE |  A LBANY ,  N EW Y ORK 
www.duravent.com

VARIABLE LENGTH (L V)
The Variable Length ( LV ) has one major function. It makes up odd lengths
of duct. It must not be used for expansion compensa tion.
It is shipped with a flanged retaining band assembly on the inner sliding wall.
The LV is adjustable from 7 1/2 to 28 inch. See Figure 16 .
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Figure 16 – Variable Length (LV)
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TEES
90 ° TEE (T90)
The 90° Tee is generally used to connect horizontal connectors into a vertical
section as well as a drain or inspection
fittings.
NOTE : For the maximum height of chimney above a based supported Tee, see Table 4
in the SUPPORT METHODS AND HEIGHT
LIMITS section.
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Figure 17 – T90
TEE PREC AUTION
1. Usean adjustable length in all horizontal breechings or la terals.
2. If more than ¼” of thermal expansion is expected between the
tee and the next fixed support
point;
a. Thetee should be protected from bending moments by use of an Adjustable
Length (See the section on the Adjustable Length)
b. And the use of two axis support is recommended.
3. Provide access for easy removal of Tee Ca ps.
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45 TEE (T45) and DOUBLE 45 TEE (TD45)
See Figure 18 for the 45 Tee (T45) and Figure 19 for the Double Tee
(DT45)
Isolate these Tees from the effectives of Thermal Expansion.
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Top Figure 18 T45 | Bottom | Figure 19 |Double Tee 45 (DT45)
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LATERAL TEE (BT)
The Lateral Tee (BT) is a 45 Tee with a 45 Elbow integrated in it.
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Figure 20 Lateral Tee (BT)
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HalfOuter
Retaining
BandFlow
GasFlow
Cuttablehalfsiding
outercasing
AdjustableFlanged
retainingBand
Cuttablesliding
InnerWall

9S
UBMITTAL R ECORDFOR D URA S TACK M ODELS DCL,  DAS1,  DIS1,  DIS2 AND DIS4
M&G
 D URA V ENT |  10  J UPITER L ANE |  A LBANY ,  N EW Y ORK 
www.duravent.com

TEE CAP (TC)
The Tee Cap provides access for cleaning and inspection into the duct.
Usually on horizontal runs, the Tee Cap is used to close the unused port of any T ee and
for cleanout oraccesspurposesonly
. When using c lean-outs, always seal the
connection
to prevent leaks and assure tha t the duct functions as intended. See
Figure 21
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Figure 21- Tee Cap (TC)
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DRAIN TEE CAP (DTC)
The Drain Cap ( DTC ) is used as a drain for the base of vertical installation
and must be connected to a suitable disposable point. It can also be used
as anaccess for cleanouts or access purpose.
See Figure 22 .
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Figure 22 – Drain Tee Cap (DTC)
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ELBOWS
ELBOWS (E3, E15, E30, E45, E90)
Elbows are used for changes in direction in horizontal or vertical portions of a duct
system.All elbows feature the standard joint assembly as described
in JOINT
ASSEMBLY
section. Elbows are used in combination to make different angles ranging
from 3° to 90° in horizontal and vertical segments of the duct system.
ELBOW – 3 degree (E3)
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Figure 23 – Elbow 3 Degree (E3)
ELBOW 15 degree (E15)
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Figure 24 – Elbow 15 degree (E15)
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ELBOW 30 degree (E30)
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Figure 25 – Elbow 30 degree (E30)
ELBOW 45 degree (E45)
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Figure 26 – Elbow 45 degree (E45)
ELBOW 90 degree (E90)
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Figure 27 – Elbow 90 degree (E90)
Elbows are not designed to take bending loads and must be structurally
supported. Structural parts such as posts or beams may also be needed
to hold chimney supports in position.
There is no limit on the angle or slope of an offset for gas or liquid fuel
burning appliances.
NOTE: There is a limit of 30 degree offset for solid fuel appliance
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TeeSection(soldseparate)
LargeInnerV‐band
Insulationband
SmallerV‐band
SecureCap
SmallerV‐band
InnerCap/Drain
LargeInnerV‐band
Outercasingcap
/handlesInner
Outercasingcap
/handlesInner
Removable
AlignmentSleeve
Removable
AlignmentSleeve
Removable
AlignmentSleeve
Removable
AlignmentSleeve
Removable
AlignmentSleeve

10
SUBMITTALRECORDFORDURASTACKMODELSDCL,DAS1,DIS1,DIS2ANDDIS4
M&GDURAVENT|10JUPITERLANE|ALBANY,NEWYORK
www.duravent.com

ELBOW OFFSETS
The following tables provide the MINIMUM offsets for the
various elbows Table 8a, 8b, 8c and 8d
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Figure 28 – MINIMUM OFFSET for ELBOWS
TABLE8a‐MinimumOffsetforEachElbow‐DCL
Diameter
Ø (in) 3°15°30°45°90°
5 3/8241/861/4131/4
6 3/8241/465/8141/4
7 3/8243/867/8151/4
8 3/8241/271/8161/4
9 3/821/845/871/2171/4
10 3/821/843/473/4181/4
11 3/821/847/88191/4
12 3/821/8583/8201/4
13 3/821/451/885/8211/4
14 3/821/451/487/8221/4
16 3/823/851/291/2241/4
18 3/823/853/4101/8261/4
20 3/821/261/8105/8281/4
22 3/821/263/8111/4301/4
24 3/825/865/8117/8321/4
26 3/825/867/8121/2341/4
28 3/823/471/813361/4
30 3/823/473/8135/8381/4
32 3/827/875/8141/8401/4
34 3/838143/4421/4
36 3/8381/4153/8441/4
Dimensionsareininches
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TABLE 8b Minimum Offset for Each Elbow -
DAS1 & DIS1
Diameter
Ø (in) 3° 15° 30° 45° 90°
5 1/2 2 1/2 5 1/4 8 1/4 18 1/2
6 1/2 2 1/2 5 3/8 8 1/2 19 1/2
7 1/2 2 5/8 5 1/2 8 3/4 20 1/2
8 1/2 2 5/8 5 3/4 9 1/8 21 1/2
9 1/2 2 5/8 5 7/8 9 3/8 22 1/2
10 1/2 2 5/8 6 9 5/8 23 1/2
11 1/2 2 3/4 6 1/8 10 24 1/2
12 1/2 2 3/4 6 1/4 10 1/4 25 1/2
13 1/2 2 3/4 6 3/8 10 1/2 26 1/2
14 1/2 2 3/4 6 1/2 10 7/8 27 1/2
16 1/2 2 7/8 6 3/4 11 3/8 29 1/2
18 1/2 3 7 12 31 1/2
20 1/2 3 7 1/4 12 5/8 33 1/2
22 1/2 3 1/8 7 5/8 13 1/8 35 1/2
24 1/2 3 1/8 7 7/8 13 3/4 37 1/2
26 1/2 3 1/4 8 1/8 14 3/8 39 1/2
28 1/2 3 1/4 8 3/8 14 7/8 41 1/2
30 1/2 3 3/8 8 5/8 15 1/2 43 1/2
32 1/2 3 3/8 8 7/8 16 1/8 45 1/2
34 1/2 3 1/2 9 1/8 16 3/4 47 1/2
36 1/2 3 1/2 9 1/2 17 1/4 49 1/2
Dimensions are in inches
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11
S UBMITTAL R ECORDFOR D URA S TACK M ODELS DCL,  DAS1,  DIS1,  DIS2 AND DIS4
M&G
 D URA V ENT |  10  J UPITER L ANE |  A LBANY ,  N EW Y ORK 
www.duravent.com

TABLE 8c Minimum Offset for Each Elbow -
DIS2
Diameter
Ø (in) 3° 15° 30° 45° 90°
5 1/2 2 5/8 5 1/2 8 3/4 20 1/2
6 1/2 2 5/8 5 3/4 9 1/8 21 1/2
7 1/2 2 5/8 5 7/8 9 3/8 22 1/2
8 1/2 2 5/8 6 9 5/8 23 1/2
9 1/2 2 3/4 6 1/8 10 24 1/2
10 1/2 2 3/4 6 1/4 10 1/4 25 1/2
11 1/2 2 3/4 6 3/8 10 1/2 26 1/2
12 1/2 2 3/4 6 1/2 10 7/8 27 1/2
13 1/2 2 7/8 6 5/8 11 1/8 28 1/2
14 1/2 2 7/8 6 3/4 11 3/8 29 1/2
16 1/2 3 7 12 31 1/2
18 1/2 3 7 1/4 12 5/8 33 1/2
20 1/2 3 1/8 7 5/8 13 1/8 35 1/2
22 1/2 3 1/8 7 7/8 13 3/4 37 1/2
24 1/2 3 1/4 8 1/8 14 3/8 39 1/2
26 1/2 3 1/4 8 3/8 14 7/8 41 1/2
28 1/2 3 3/8 8 5/8 15 1/2 43 1/2
30 1/2 3 3/8 8 7/8 16 1/8 45 1/2
32 1/2 3 1/2 9 1/8 16 3/4 47 1/2
34 1/2 3 1/2 9 1/2 17 1/4 49 1/2
36 1/2 3 5/8 9 3/4 17 7/8 51 1/2
Dimensions are in inches
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TABLE 8d Minimum Offset for Each Elbow -
DIS4
Diameter
Ø (in) 3° 15° 30° 45° 90°
5 1/2 2 3/4 6 1/8 10 24 1/2
6 1/2 2 3/4 6 1/4 10 1/4 25 1/2
7 1/2 2 3/4 6 3/8 10 1/2 26 1/2
8 1/2 2 3/4 6 1/2 10 7/8 27 1/2
9 1/2 2 7/8 6 5/8 11 1/8 28 1/2
10 1/2 2 7/8 6 3/4 11 3/8 29 1/2
11 1/2 2 7/8 6 7/8 11 3/4 30 1/2
12 1/2 3 7 12 31 1/2
13 1/2 3 7 1/8 12 1/4 32 1/2
14 1/2 3 7 1/4 12 5/8 33 1/2
16 1/2 3 1/8 7 5/8 13 1/8 35 1/2
18 1/2 3 1/8 7 7/8 13 3/4 37 1/2
20 1/2 3 1/4 8 1/8 14 3/8 39 1/2
22 1/2 3 1/4 8 3/8 14 7/8 41 1/2
24 1/2 3 3/8 8 5/8 15 1/2 43 1/2
26 1/2 3 3/8 8 7/8 16 1/8 45 1/2
28 1/2 3 1/2 9 1/8 16 3/4 47 1/2
30 1/2 3 1/2 9 1/2 17 1/4 49 1/2
32 1/2 3 5/8 9 3/4 17 7/8 51 1/2
34 1/2 3 3/4 10 18 1/2 53 1/2
36 1/2 3 3/4 10 1/4 19 55 1/2
Dimensions are in inches
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ADAPTERS
TAPERED INCREASER (TIN Ø)
The Tapered Increaser Adapter is used for a diameter change in the vent
system.
Used when there is a sufficient length for duct run available for the
size change.
The TINØ is uses 2” of length per 1” increment diameter change.
The TINØ is considered to have the same load strength as a straight duct. See
Figure 29
.
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Figure 29 – Tapered Increaser Adapter (TIN Ø)
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Removable
AlignmentSleeve

12
S UBMITTAL R ECORDFOR D URA S TACK M ODELS DCL,  DAS1,  DIS1,  DIS2 AND DIS4
M&G
 D URA V ENT |  10  J UPITER L ANE |  A LBANY ,  N EW Y ORK 
www.duravent.com

ECCENTRIC TAPERED INCREASER (ETINØ)
The Eccentric Tapered Increaser Adapter is similar as the TaperedIncreaser
Adapter except the smaller diameter is offset from the larger diameter. When
installed horizontally, the ETINØ keep a flat slope unlike the TINØ . See Figure
30
.
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Figure 30 – Eccentric Tapered Increaser Adapter (ETIN Ø)
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PLATE AND WALL SUPPOR T
ANCHOR PLATE (AP)
Anchor Supports are designed to provide support to vertical sections and provide
fixed-point support for horizontal sections. See
Figure 31
NOTE: Rings are installed at 90° to plates.
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Figure31–AnchorPlate(AP)
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The Plate Support must be attached to the building structure or supported
with rigid structural members. See Table 4 for maximum supported height.
A Plate Support is to be attached only to non-combustible construction
such as
block, concrete or steel with clearance that is adequate for
installation and access. For maximum support, the entire perimeter of the
Plate Support must be
a ttached to structural framing.
WARNING: RISK OF FIRE - DO NOT ATTACH THE PLATE SUPPORT TO
COMBUSTIBLE CONSTRUCTION
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HEAVY DUTY WALL SUPPORT (WSHD)
When attached to a non-combustible wall with brackets and struts, a Hea vy Duty
Wall Support makes up a fixed-point.
The clamp rings are installed with the splits 90°
apart so that they support each
other . The notches in the clamp rings are aligned
with the draw screws of the flange
band. The Hea vy Duty Wall Support Assembly is
bolted together with provided
hardware. It is made with adjustable struts, which allo ws
a variable c learance from the non-combustible wall to the grease duct outer casing.
The minimum clearance varies with the size of the wall support, but is between 2 and
2
½” (based on the angle shape of the Full Angle Ring ( FA R ). See Figure 33. The
maximum clearance for all sizes is around 10”. See
Figure 34
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Figure32–HeavyDutyWallSupport(WSHD)
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Illustration below shows the Heavy Duty Wall Support at the
MINUMUM distance from structure
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Figure 33 – Heavy Duty Wall Support (WSHD)
at Minimum distance
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Removable
AlignmentSleeve
ClampRing
Plate
Su
pp
ort
Minimum2to2½”
Vent
section
Vent
section
Straight
alignment

13
S UBMITTAL R ECORDFOR D URA S TACK M ODELS DCL,  DAS1,  DIS1,  DIS2 AND DIS4
M&G
 D URA V ENT |  10  J UPITER L ANE |  A LBANY ,  N EW Y ORK 
www.duravent.com
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Illustration below shows the Heavy Duty Wall Support at the
MAXIMUM distance from structure
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Figure 34 – Heavy Duty Wall Support (WSHD)
at Maximum distance
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HEAVY DUTY WALL GUIDE (WGHD)
The Heavy Duty Wall Guide is designed to complement the Heavy Duty W all
Support (See Figure 3 2 ). It is used as a lateral guide and is installed
immediately below the outer closure band near the duct joint. The outer band
must be able
to move away from the Heavy Duty Wall Guide when thermal
expansion occurs. The Heavy Duty Wall Guide is bolted together with hardware
provided to form a rigid assembly
.
NOTE: Seal joint with S-375 sealant above and below support if
exposed to weather.
WARNING: RISK OF FIRE - DO NOT ATTACH THE WALL GUIDE TO
COMBUSTIBLE CONSTRUCTION
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Figure 35 – Heavy Duty Wall Guide (WGHD)
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HEAVY DUTY FLOOR GUIDE (FGHD)
A Heavy Duty Floor Guide is similar in function to a Heavy
Duty Wall Guide or Full Angle Ring, but has been modified for
use at floor penetrations. The angle brackets and straps hold
the FGHD centered in the floor penetration. Maximum floor
opening “X” is the Duct ID + 10”
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Figure 36 – Heavy Duty Floor Guide (FGHD)
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FULL ANGLE RING (FAR)
A Full Angle Ring is used as a guide to prevent the duct from
flexing due to lateral loading. The angle ring is split for ease
of installation. It is 1/8” larger inside diameter than the
outside diameter of the duct to allow movement of the duct
inside the ring.
Most supports incorporate the use of the Full Angle Ring due
to it providing structural integrity to the duct.
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Figure 37 – Full Angle Ring (FAR)
HALF ANGLE RING (HAR)
A Half Angle Ring is used as a saddle in horizontal or sloped
runs.
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Figure 38 – Half Angle Ring (HAR)
NOTE: Both the Full Angle Ring and the Half Angle Ring are
designed to accept ½” threaded rod
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Maximum10”
Vent
section
Vent
section
Wall
bracket
Wall
bracket
FullAngleRing
Strut
bracket
AngleBrackets
X
X
Straps
Floor
FullAngleRing

14
S UBMITTAL R ECORDFOR D URA S TACK M ODELS DCL,  DAS1,  DIS1,  DIS2 AND DIS4
M&G
 D URA V ENT |  10  J UPITER L ANE |  A LBANY ,  N EW Y ORK 
www.duravent.com

SECTION E – GUIDELINE FOR LOCATION OF
SUPPORTS
Supports can be used in different combinations to secure the
duct in place.
ADJUSTABLE, VARIABLE and BELLOW LENGTH
To prevent the LA, LV or LB from sagging, it is recommended
that the chimney section adjacent to the LA, LV or LB is
supported or guided.
When necessary, properly guide an adjustable length (LA) by
installing a Heavy Duty Wall Guide (WGHD) or any support
immediately below the chimney joint on the adjacent section.
TEE SUPPORT
The Tees must be properly supported to protect them from
bending forces. It can be done by means of an Anchor Plate
(AP), Anchor Plate Length (APL) or Heavy Duty Wall Support
(WSHD). When a Tee is used at the base of the vertical
riser, the preferred location for the support is above the Tee,
thus suspending the Tee.
ELBOW SUPPORT
Elbows are to be supported on one end with either an Anchor Plate
(AP), an Anchor Plate Length (APL) or a Heavy Duty Wall Support
(WSHD).
THROUGH FLOOR / CEILING SUPPORT
Supports for chimney that penetrate a non-combustible floor are to
be positioned on the top side of the floor. Include supports as per
the height limits in Table 3 and use either an Anchor Plate (AP) or
an Anchor Plate Length (APL) installed above structural framing
members.
THROUGH WALL SUPPORT
Chimney that penetrates a wall should be supported on both side
of the penetration. It can be supported by bracing with a Half
Angle Ring (HAR), an Anchor Plate (AP) or an Anchor Plate Length
(APL).
SECTION F – ROOF PENETRATION and FLASHINGS
Flashing (F)
The flat Roof Flashing (F) is used in conjunction with Storm Collar
(SC) for weatherization on a flat roof.
 
Figure 39 – Flat Roof Flashing (F)
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Storm Collar (SC)
The storm collar is installed above the opening of the flashing and
clamps to the outside of the vent. The top of the storm collar
should be sealed using S-375
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Figure 40 – Storm Collar (SC)
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Adjustable Flashing (F30)
The Adjustable Flashing (F30) is used in conjunction with Storm
Collar (SC) for weatherization on a flat roof with a 5 degree to 30
degree pitch.
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Figure 41 – Adjustable Flashing (F30)
GUYING AND BRACING
1.
Proper guying and bracing is essential for part of the Chimney that
extends
above the roof or parapet wall. The grease duct at this point is
subject to
wind conditions and needs special attention for proper
stabilization.
2.
If the chimney above the roof does not exceed dimension H, no special
guying or
bracing is required. Ho wever , to protect the flashing from la teral
movement, a guide must be installed at the roof level.
3.
For chimney 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 minimize 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.
Guy Section details and cable attachments
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Sealatvent
withS‐375

15
SUBMITTALRECORDFORDURASTACKMODELSDCL,DAS1,DIS1,DIS2ANDDIS4
M&GDURAVENT|10JUPITERLANE|ALBANY,NEWYORK
www.duravent.com

SECTION G – TERMINATION
GENERAL
An upward discharge (such as with an Exit Cone or Open Top) provides the most
effective means of dispersing chimney gases into the atmosphere and a way from
immediate surroundings. Such terminations however,
will allow entry of rain
unless there
is upward flow at high velocity. A Stack Cap is only partially effective
in excluding rain. Its effectiveness depends on chimney gas flow ra
te, raindrop
characteristics and wind velocity
.
If rain is to enter the chimney, install a drain tee cap at the bottom of vertical run. Use
a “P” trap in the drain if
the system is under positive pressure.
EXIT CONE (P-EC)
The Exit Cone is of double wall construction, with separable inner and outer
cones. The inner cone has a 28° included cone angle and is sized to increase outlet
velocity to 1.5 times chimney velocity. It attaches with a standard Inner
V-Band to
the uppermost chimney pipe
section. The outer cone is then pushed down into contact
with the inner cone, clamped to the outer pipe, and the
ga p between cones is sealed
with silicone. T o prevent rain from reaching an a ppliance, this installation requires use
of a Drain Section (P-DS), drained Tee
or both in the vertical chimney. It is
recommended to fasten (3) self-tapping screws around the
bottom circumference of
the exit cone outer wall (120° apart) into the upper outer wall of the pipe section below.
Do not penetrate the inner wall.
RAIN CAP (RC )
NOTE: Stack Caps are not recommended for use with engine or turbine exhausts. The
Stack Cap combines partial protection against rain entry with low exit flow
resistance. (Resistance coefficient is roughly 0.05 velocity heads.) It is mounted to
the end of a standard pipe section by use of the standard V-
Band. A Closure Ring is
provided as part of the Stack Cap so that the insulating air space is maintained
through the upper end of the chimney
.
EXCESSIVE PRESSURE RELIEF VALVE (P-ER)
Excessive Pressure Relief Valves are intended to help control the venting of
pressure which may occur during an exhaust system backfire. Engines have the
potential to inject unburned fuel into an exhaust system during start up or due to an
engine malfunction.
This unburned fuel creates a condition where a backfire could occur . The Explosion
Relief Valve will help prevent damage to other parts such as Flex Connectors,
Silencers, Catalytic Converters, Convoluted Bellows and Heat Recovery Equipment.
Further precedence for use of Excessive Pressure Relief Valves can be found in
NFPA 37, “Standards for the Installa tion and Use of Sta tionar y Combustion Engines
and Gas T urbines”. The Excessive Pressure Relief Valve should be located in the
beginning of the system and is
supplied with bolts, washers, nuts, and gasket to
provide a complete gas tight connection to the 125/150 lb. ANSI flanged Flange
Adapter
. The orientation of the Relief V alve should be positioned upright, as sho wn
Figure 42 for optimum performance.
MAINTENANCE OF ER VALVE IF USED OUTDOORS: It is RECOMMENDED to a pply an
exterior grade high heat paint to the Guide Plate, Valve Seat, Valve Plate,
and
Flange Adapter to ensure maximum corrosion resistance. (Ex. Rust-Oleum V200
series High Heat Industrial Aerosol) Caution: This device is designed to relieve
excessive pressure (27” W C with standard springs) in the case of an engine
malfunction for the sole purpose of protecting the physical integrity of the exhaust
system and related parts. If such malfunction occurs, the device will release hot
gases, sparks and/or flames into the immediate vicinity of the area it is located
in.
As such, this device should never be installed where human contact m a y
occur due to
such release.
Excessive Pressure Relief Valve
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Figure 42 – Excessive Pressure Relief Valve
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GENERAL INFORMATION
M&G DuraVent reserves the right to make changes at any time,
without notice,
in design, materials, specifications, prices.
Consult your local distributor
for chimney system code
information.
WARRANTY
These products have a 15-year limited warranty. Please read the
warranty to be
familiar with its coverage.
Retain this manual. File it with your other documents for future
reference.
PRODUCT REFERENCE INFORMATION
Please contact M&G DuraVent for the phone number of your
nearest DuraVent dealer who will ans
wer your questions or address
your concerns.
Further information may be obtained by visiting:
www.duravent.com
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