DuraVent DuraTech Series User manual

DuraTech
All-Fuel Chimney System
5” to 8” diameter
Installation Instructions

A MAJOR CAUSE OF VENT RELATED FIRES IS FAILURE
TO MAINTAIN REQUIRED CLEARANCES (AIR SPACES) TO
COMBUSTIBLE MATERIALS. IT IS OF THE UTMOST IMPORTANCE
THAT DOUBLE WALL DURATECH BE INSTALLED ONLY IN
ACCORDANCE WITH THESE INSTRUCTIONS.
NOTE:
Read through all of these instructions before
beginning your installation. Failure to install
as described in this instruction will void the
manufacturer’s warranty, and may have an
effect on your homeowner’s insurance and
UL listing status. Keep these instructions for
future reference. This booklet also contains
instructions for installing a venting system
within an existing masonry chimney, and
for installations passing through a cathedral
ceiling.
Dear Customer, Installer, or End User:
I welcome any comments regarding matters
pertaining to our DuraVent products.
I welcome any ideas, input or complaints and
I’ll make sure that someone responds directly
back to you.
Send your emails to:
[email protected]
If you are searching for tech support or product
information, please phone us at 800-835-4429.
Or email us at:
[email protected]
Sincererly,
Steve Eberhard, President and CEO
M&G DuraVent, Inc.
LISTED
MH7399

3
CONTENTS
CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PERMITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DURATECH CHIMNEY APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
EQUIPMENT & MATERIALS.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CHIMNEY DIAMETER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CHIMNEY HEIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CHIMNEY PLACEMENT. . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CHIMNEY ENCLOSURE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STOVE RECOMMENDATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STEP-BY-STEP DIRECTIONS . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . 6
CEILING SUPPORTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OFFSET ELBOW INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
EXTENDED ROOF BRACKET INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . .13
ROOF SUPPORTED INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
TEE-SUPPORTED INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
MASONRY FIREPLACE INSTALLATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
ZERO-CLEARANCE FIREPLACE INSTALLATIONS . . . . . . . . . . . . . . . . . . . 22
CONNECTION FROM APPLIANCE TO CHIMNEY SYSTEM . . . . . . . . . . . . . 22
CHIMNEY MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DuraTech
ALLFUEL CHIMNEY SYSTEM, 5” TO 8” DIAMETER
For the most up-to-date installation instructions, see www.duravent.com

4
CLEARANCES
Always allow at least a 2-inch clearance
between DuraTech Chimney Pipe and any
combustible materials. Never ll any required
clearance space with insulation or any other
materials. Combustible materials include
lumber, plywood, sheetrock, plaster and lath,
furniture, curtains, electrical wiring and building
insulation. Keep single wall stovepipe at least
18 inches away from combustible materials,
unless a clearance reduction system that is
acceptable to the authority having jurisdiction
is used, or the appliance to be installed is
listed and the instructions specify a different
clearance.
PERMITS
Contact your local Building Ofcial or Fire
Ofcial regarding permits, restrictions, and
installation inspections in your area.
DURATECH CHIMNEY
APPLICATIONS
DuraTech Chimney is a complete chimney
system tested and listed to UL 103 HT for the
United States, and ULC S604 in Canada. In
the U.S., DuraTech Chimney can be used with
wood stoves, replaces, reboxes, furnaces,
boilers, water heaters, stoves, ranges, or
other residential-type appliances fueled by oil,
gas, coal, or wood, that require a UL103 HT
chimney system. In Canada, DuraTech can
be used with oil & gas red appliances listed
for use with a Type A Chimney, in accordance
with ULC S604 . DuraTech is also listed for use
in Canada with some factory-built replaces;
check with your replace manufacturer.
Otherwise, DuraTech has not been approved
for use with solid fuel appliances in Canada.
DuraTech Chimney is available in 5”, 6”, 7” &
8” diameters (UL 103 HT Rated), as well as
10”, 12”, 14” & 16” diameters (UL 103 Rated).
Do not use with forced draft, positive-pressure
appliances. The DuraTech Chimney system
may have a maximum of two (2) offsets (four
elbows total) of 30° from vertical. DuraTech
Chimney is listed under UL Re-examination
Service Number MH7399.
EQUIPMENT & MATERIALS
Hammer Drill
Caulking Gun Plumb Bob
Screwdrivers Tin Snips
(Phillips & Standard)
Saber or Keyhole Saw Level
Dependable Ladder Tape Measure
Proper Gloves and Shoes Eye Protection
Materials You May Need:
500ºF RTV Silicone Sealant
8 Penny Nails
#8, 2-1/2” & 1-1/2” Wood Screws
Roong Nails
INSTALLATION NOTES
Proper planning for your DuraTech Chimney
installation will result in greater safety,
efciency, and convenience, as well as
saving time and money. You must use
only authorized DuraTech Chimney parts
to maintain a listed Chimney system (not
including the connector pipe). Do not mix
parts or try to match with other products,
or use improvised solutions. Do not install
damaged or modied parts. Table 1 lists the
authorized DuraTech Chimney components.
Practice good workmanship. Sloppy work
could jeopardize your chimney’s safety. Keep
electrical wiring and insulation away from all
chimneys and stovepipes. If you have any
questions, be sure to contact either your dealer
or DuraVent directly.

5
CHIMNEY DIAMETER
Follow the appliance manufacturer’s
instructions to determine chimney diameter
and clearances between combustible materials
and your heating appliance. Never choose
a chimney with an inside diameter smaller
than your appliance’s outlet. To calculate the
chimney’s outside diameter, add 2 inches to
the inside diameter.
CHIMNEY HEIGHT
The National Fire Protection Association
Standard #211 states: “Chimneys shall extend
at least three feet above the highest point
where it passes through the roof of a building,
and at least two feet higher than any portion
of a building within ten feet.” (Fig 1) DuraTech
Chimney may be installed up to 60 feet high. If
the chimney extends more than 5 feet above
Figure 1
Figure 2
DuraTech Chimney Components
6”, 12”, 18”, 24”, 36”, 48” pipe
sections
Firestop Radiation
Shield
Elbow with swivel Attic Insulation Shield
Tee with Tee Cap Elbow Strap
Adjustable Tee Support Bracket Adjustable Wall Strap
Chimney Cap Anchor Plate
Round Ceiling Support Box Extended Roof Bracket
Trim collars for Round
Support Boxes
Adjustable Roof
Flashing
Square Ceiling Support Box Chase Top Flashing
Flat Ceiling Support Box Flat Roof Flashing
Roof Support Storm Collar
Trim collar for Roof Support
Transistion Anchor Plate
Wall Thimble Base Tee and Double
Base Tee
Finishing Collar Firestop
Reduced Clearance
Support Box
CAS Ceiling Support
Table 1
2 FT MIN ABOVE HIGHEST
POINT OF ROOF WITHIN
10 FT
10 FT
3 FT MIN
ABOVE
ROOF
ATTIC
INSULATION
SHIELD
FIRESTOP
RADIATION
SHIELD
(INSIDE)
ENCLOSURE
MUST HAVE 2
INCHES OF
CLEARANCE
BETWEEN
CHIMNEY AND
WALL
SUPPORT
BOX
FIRST
FLOOR
OCCUPIED
SECOND
FLOOR
ATTIC
SPACE
the roof, an Extended Roof Bracket must be
used (see page 12). Due to the overlap of the
joints, subtract 1-1/4 inches from each Chimney
Section’s height to calculate installed height.

6
CHIMNEY PLACEMENT
When deciding the location of your chimney,
try to avoid modications to roof beams and
other structural components of the building.
CHIMNEY ENCLOSURE REQUIRE-
MENTS
Through Rooms: Interior chimneys shall be
enclosed where they extend through closets,
storage areas, occupied spaces, or anyplace
where the surface of the chimney could be
contacted by persons or combustible materials.
Maintain at least a 2-inch air space between
the outer wall of the chimney and the enclosure
(Fig 2).
Multi-Story: Consult local building codes for
requirements in your area. In the U.S., the
National Fire Protection Association Standard
#211 states: “Factory-built chimneys that
pass through oors of buildings requiring the
protection of vertical openings shall be enclosed
with approved walls having a re resistance
rating of not less than one hour when such
chimneys are located in a building less than
4 stories in height, and not less than 2 hours
when such chimneys are located in a building
more than 4 stories in height.” In Canada,
except in single-family and two-family dwellings,
chimneys which extend through another story
must have an enclosure with a re resistance
rating equal to or greater than that of the oor or
roof assembly through which they pass.
Cold Climates: In cold climates, chimneys
mounted on an outside wall should be
enclosed in a chase. Exterior chases reduce
condensation and creosote formation, and
enhance draft. Include an access door by the
Tee Cap for chimney cleaning (Refer to Fig 23).
STOVE RECOMMENDATIONS
Follow the stove manufacturer’s instructions.
The requirements stated below pertain to
all stoves or other appliances installed with
DuraTech Chimney systems.
Choice: Choose an appliance that is listed by
a recognized testing laboratory, is appropriate
for your needs, and is not larger than required.
Installation: Once the chimney system is in
place, install the stovepipe to connect the
appliance to the chimney as described in the
appliance manufacturer’s instructions. Be sure
to maintain all required clearances.
Flues: Connect only one solid fuel appliance
per chimney.
Operation: Follow the appliance
manufacturer’s instructions for maximum
efciency and safety. Overring can damage
the appliance, stovepipe and chimney.
Fuels: Do not burn driftwood, plastic, or
chemically treated wood such as railroad
ties. They are corrosive to your appliance,
stovepipe and chimney. Follow the appliance
manufacturer’s instructions and safety manual
in regards to fuels. Not all appliances are
equipped to burn coal. Coal with a low sulfur
content will reduce the possibility of corrosion.
Mobile Homes: Please read the appliance
manufacturer’s instructions and safety manual
carefully. Not all appliances are listed for use
in mobile homes.
STEP-BY-STEP DIRECTIONS
There are ve general types of DuraTech
Chimney installations:
1.Ceiling-supported
2.Roof-supported
3.Tee-supported (through-the-wall)
4.Masonry Fireplace
5.Zero-Clearance Fireplace
Review the step-by-step directions before
beginning your installation.

7
CEILING SUPPORTED
1. Place Appliance: Position the appliance
according to the manufacturer’s instructions.
The ue outlet collar should be placed
between the rafters or joists above, if possible.
2. Frame Support Opening: Drop a plumb
bob to the center of the appliance’s ue outlet
and mark this center point on the ceiling. Refer
to Table 2 for specic framing and clearance
dimensions. Mark appropriate cutting lines
around the center point. Cut a square hole in
the ceiling for the Support Box. Frame a level,
square opening centered over the hole which
you have cut. (Figures 3 and 4).
Figure 3
Figure 4 Figure 5
3. Install Support Box: For installation into
a at ceiling, there is the option of the Round
Support Box, the Flat Ceiling Support Box,
the Square Ceiling Support Box , Reduced
Clearance Support Box , or the CAS Ceiling
Support. The CAS Ceiling Support is only
used when installing the CAS system. Refer
to the DuraTech CAS Installation Instructions
for directions on how to install the remainder
of the Combustion Air System.. The Flat
Ceiling Support Box is primarily used for
Oil Appliances and comes unpainted. For
the Square Ceiling Support Box, Reduced
Clearance Support Box, and the CAS Ceiling
MINIMUM OF 3
INCHES BELOW
FINISHED CEILING
18 INCHES
MINIMUM FOR
SINGLE WALL
STOVEPIPE
ADJUSTABLE FLASHING
CHIMNEY SECTIONS
ATTIC INSULATION SHIELD
ROUND TRIM COLLAR
FRAMED OPENING
ROUND SUPPORT
BOX
CHIMNEY CAP
STORM
COLLAR
JOISTS & FRAMING
3 INCH MIN REQUIRED
BELOW FINISHED CEILING
3 INCH MIN BELOW
FINISHED CEILING
ROUND SUPPORT BOX WITH
SQUARE TRIM COLLAR
ROUND SUPPORT BOX WITH
ROUND TRIM COLLAR

8
Support, refer to the Square ceiling installation
below. The Round Ceiling Support Box has
the option of a square or round Trim Collar
available (Fig 5). The bottom of the Round
Support Box must extend at least 3 inches
below the nished ceiling. Level the Support
Box and secure it to the framing using at least
three 8-penny nails per side (min. of 12 total).
Alternatively, you may use 1-1/2” #8 wood
screws (min. of 12 total), instead of nails.
Next, secure the Trim Collar (round or square)
to the framing members using the (4) 1” long,
round-head wood screws provided (Fig 6).
For installation into a cathedral ceiling, you
must use the Square Ceiling Support Box or
Reduced Clearance Support Box (or the CAS
Ceiling Support if installing the CAS system)
and the two-piece Trim. The bottom of the
square portion of the Support Box must be a
minimum of 2-inches lower (round portion is
an additional 3 inches lower) than the nished
ceiling at the lowest side of the penetration
(Fig 5 & 6). Level the Support Box and
secure it to the framing using at least three (3)
8-penny nails per side (minimum of 12 nails
total), or a minimum of (3) #8, 1-1/2” wood
screws. Adjust the overlapping “U-shaped”
Trim pieces so they cover the Support Box,
and secure them to the framing members
using the (6) 1-1/4” long, round head wood
screws provided (see Fig 6).
4. Frame Openings: Frame openings in
each ceiling or oor above the Support Box
(Fig 7). These openings are to hold the
Firestop Radiation Shield and Attic Insulation
Shield. Locate each opening by dropping a
plumb bob to the four corners of the opening
below. Maintain the framing dimensions as
specied in Table 2.
Warning: other than the framing for the
Reduced Clearance Support Box, any
combustible materials around the chimney
must still meet the minimum 2” clearance
requirement. If Elbows must be used to
avoid an obstruction, refer to the Offset Elbow
Installation section.
5. Cut Roof Opening: Cut an opening in the
roof directly above the opening below, and
at least 4 inches larger than the chimney’s
outside diameter to provide at least a
2-inch clearance all around the chimney.
The chimney must be centered within this
Figure 6
Figure 7
MIN OF 2
INCHES
BELOW
FINISHED
CEILING
WOOD SCREWS ARE
REQUIRED
WOOD SCREWS ARE
REQUIRED
ROUND CEILING
SUPPORT WITH TRIM
IN PLACE
SQUARE CEILING
SUPPORT BOX WITH
TRIM FRAME
IN PLACE
CAP ADJUSTABLE
FLASHING
CHIMNEY
SECTION
ATTIC
INSULATION
SHIELD
STORM
COLLAR
FIRESTOP
RADIATION
SHIELD
CHIMNEY
SECTION
FRAMED
ENCLOSURE
2 INCH MIN
CLEARANCE
TO INSIDE OF
ENCLOSURE
MIN OF 3
INCHES BELOW
FINISHEDCEILING
18 INCH MIN FOR
SINGLE WALL
STOVEPIPE

9
Table 2
Figure 10
Figure 8
FRAMING
FIRESTOP
RADIATION SHIELD
Figure 9
TWIST CLOCKWISE
TO TIGHTEN
ATTIC INSULATION
SHIELD
Framing Dimensions
Chimney Diameter
5” 6” 7” 8”
CATHEDRAL CEILING
SUPPORT BOX
111/4” 121/4” 131/4” 141/2”
FLAT CEILING
SUPPORT BOX
111/4” 121/4” 131/4” 141/2”
ROUND CEILING
SUPPORT BOX
111/4” 121/4” 131/4” 141/4”
FIRESTOP RADIATION
SHIELD
111/4” 121/4” 131/4” 141/4”
WALL THIMBLE 111/4” 121/4” 131/4” 141/4”
CAS CEILING
SUPPORT
NA 121/4” NA 141/2”
CAS WALL THIMBLE NA 121/4” NA 141/4”
REDUCED
CLEARANCE
SUPPORT BOX
NA 101/4” NA NA
above that where the Support Box is located.
Example: in a multistory home where the
appliance is on the ground oor (Support
Box is in the 1st oor ceiling), you would
need a Firestop Radiation Shield at the 2nd
oor ceiling, and at the 3rd oor ceiling, etc.,
including where the chimney penetrates into
the attic. Figure 7 shows a typical 2-story
installation with an attic.
Note: a Firestop Radiation Shield is not
installed where the chimney penetrates
through the roof. The Firestop Radiation
Shield is installed on the underside of the
ceiling/oor framing, with the cylindrical
“tube” portion of the shield pointing
upward. (Fig 8). Use a minimum of either
(1) 8 penny nail or (1) #8, 1-1/2” wood screws
per corner. Refer to Table 2 for framing
requirements.
opening and maintain the 2-inch clearance to
combustibles.
6. Install Firestop Radiation Shield: A
Firestop Radiation Shield is required in
multistory installations at each oor penetration

10
8. Install Attic Insulation Shield: The
Attic Insulation Shield is required where the
chimney passes into an attic. Its purpose is
to prevent debris and insulation from getting
too close to the chimney (Fig 10). An installed
Attic Insulation Shield is 15 inches high. In
attic areas where this shield cannot t, you
must enclose the attic portion of the chimney
in a framed enclosure. If the chimney is fully
enclosed through the attic, an Attic Insulation
Shield is not required. If the chimney passes
into the attic, install the Attic Insulation Shield
as follows:
a. If the Firestop Radiation Shield extends
above the attic oor, no modications are
necessary. The Firestop Radiation Shield will
t inside the Attic Insulation Shield.
b. Assemble Chimney Sections until at least
18 inches of chimney extends above the
Firestop Radiation Shield.
c. Extend the Firestop Radiation Shield tube
extension (keep at least 1” overlap), and
secure in place using sheet metal screws.
d. Slip the Attic Insulation Shield over the
Chimney and Firestop Radiation Shield until
the base sits squarely on the framed opening
(Fig 7 & 10).
e. Secure the Attic Insulation Shield to the
top of the framed opening using at least (3)
8-penny nails or (3) #8, 1-1/2” wood screws
per side (Fig 10).
f. Wrap the Collar of the Attic Insulation Shield
around the chimney and fasten it loosely. Slide
the Collar down to meet the Attic Insulation
Shield. Slip the tab through the adjacent slot
and fold it back to tighten and secure the
Collar (Fig 11).
9. Attach Flashing: In new construction,
assemble the Chimney Sections to a point
above the roof, then slip the Flashing over
the chimney. On an existing roof, center
and install the Flashing before extending the
Figure 11
Figure 12
Figure 13
ROOFING
FASTENERS
ADJUSTABLE
FLASHING
PUSH COLLAR
DOWN TO
FLASHING AND
SEAL WITH NON-
HARDENING HIGH-
TEMP SILICONE
SEALANT
7. Assemble Chimney Sections: Lower
the female end of the rst Chimney Section
in the Support Box (Fig 9). It will twist-lock
clockwise onto the male end of the Support
Box. Turn Pipe Sections rmly clockwise to
lock them together. Sheet metal screws are
not required, but they may be used to reinforce
the connection, if desired. Use only 1/2” (or
shorter) sheet metal screws. Do not penetrate
the inner liner of the chimney.

11
chimney above the roof. Allow space to permit
sliding the next Chimney Section up through
the Flashing. Always insure the chimney
remains vertical (use a level), and that at least
a 2-inch clearance to combustible materials is
maintained all around. Install the upper edge
of the Flashing under the roong. Nail to the
roof along the upper edge and down each side
with 1-inch roong nails. Do not nail the lower
edge of the Flashing (Fig 12). Seal top and
upper sides of ashing with roong compound
or sealant. Be sure to follow local building
practices, as needed. Seal all nail heads with
a non-hardening waterproof sealant. On at
or tarred and graveled roofs, nail and seal the
Flat Roof Flashing to the roof on all sides with
roong compound. Do not put screws through
the Flashing into the Chimney Pipe.
10. Finish Top: Apply a high-temperature
(500ºF), non-hardening waterproof sealant
around the chimney at the point where the
Storm Collar will meet the chimney just above
the Flashing. (Figures 12 and 13). Slide the
Storm Collar down over the chimney to the top
of the Flashing. Tighten and seal the Storm
Collar against the sealant. After installing
sufcient Chimney Sections to meet the height
requirement (Fig 1), attach the Chimney Cap
onto the top of the chimney by holding the
collar of the cap and twist locking it clockwise
onto the chimney. Do not hold upper portion
of the cap and twist, as this may damage the
cap. The Chimney Cap can be removed for
chimney cleaning as described in the Chimney
Maintenance section of the instructions. Use
an Extended Roof Bracket if the chimney
extends more than 5 feet above the roof.
(Figures 16 & 17 in the Extended Roof
Bracket section). If you are located in heavy
snow country, it is recommended that a Snow
Splitter be installed. The Snow Splitter can be
purchased from DuraVent or fabricated locally
Figure 14
from heavy gauge sheet metal (Fig 14). This
will protect the chimney by routing the snow
around it.
11. Enclosures: Enclose chimneys where
they pass through occupied spaces, including
closets. Always maintain at least a 2 inch
clearance between the chimney and any
combustible materials. Interior enclosures
may be constructed with standard framing and
sheathed with sheetrock or plywood. Use Wall
Straps as needed to maintain a minimum of 2
inches of air space between the chimney and
combustible materials.
OFFSET ELBOW INSTALLATION
Elbows are manufactured in 15° and 30°
angles measured from the vertical. A 30°
Elbow is the largest that can be used in an
offset. A 30° Elbow may not be combined
with a 15° Elbow to make a 45° offset. Avoid
Elbows if possible, since a totally vertical
chimney is more efcient. When Elbows
are necessary to avoid obstructions such as
rafters, ridgepoles, or joists, use no more than
SPLITTER
SPLITTER
TOP VIEW

12
2 pairs of Elbows in any one chimney system.
1. Attach Elbows: Attach Elbow to Chimney
Section or other Elbow by twisting clockwise
until they lock rmly. Attach one Elbow to the
Chimney Section below, and align it for the
offset. Elbows for DuraTech have a swivel
feature that allow for 360º rotation at their base
for ease of installation. Refer to Table 3 to
determine the required offset length and attach
an appropriate length (or lengths) of Chimney
Section(s) above the Elbow. Important:
For each chimney pipe section in the offset
(between the elbows), there must be an Elbow
Figure 15
Table 3
Elbow
Angle
from
Vertical
Chimney
Length
Between
Elbows
Offset
Inches
Rise
Inches
15” 0” 2” 16 ½”
15” 6” 3 ¼” 21 ¼”
15” 12” 4 ¾” 27
15” 18” 6 ¼” 32 ¾”
15” 24” 8” 38 ½”
15” 36” 11” 50 ¼”
15” 48” 14 ¼” 61 ¾”
15” 48” + 6” 15 ½” 66 ½”
15” 48” + 12” 17” 72 ¼”
15” 48” + 18” 18 ½” 78:
15” 48” + 24” 20” 83 ¾”
30” 0” 4” 15 ¾”
30” 6” 6 ¼”
30” 12” 9 ¼” 25 ¼”
30” 18” 12 ¼” 30 ¼”
30” 24” 15 ¼” 35 ½”
30” 36” 21 ¼” 46”
30” 48” 27 ¼” 56 ¼”
30” 48” + 6” 29 ¾” 60 ½”
30” 48” + 12” 32 ¾” 65 ¾”
30” 48” + 18” 35 ¾” 71”
30” 48” + 24” 38 ¾” 76”
Strap, Tee Support, or similar support method
to support the weight of the pipe and to relieve
stress on the Elbows. Attach the second Elbow
above the Chimney Section to complete the
offset (Fig 15).
2. Secure Offset: Place the Elbow Strap’s
band around the angled portion of the top
Elbow, then tighten the nut and bolt until the
clamp is rm. Wrap the Elbow Strap end over
an adjacent joist or rafter and secure it with at
ELBOW STRAP ELBOW
ELBOW
ELBOW STRAP
ADDITIONAL ELBOW
STRAPS REQUIRED
FOR EACH CHIMNEY
SECTION USED IN
OFFSET
RISE
(INCHES)
CHIMNEY
SECTION
OFFSET
(INCHES)
ELBOW STRAPS
OR TEE SUPPORTS
ARE REQUIRED TO
SUPPORT WEIGHT
OF OFFSET AND
TO RELIEVE
STRESS ON
ELBOWS TWO OR MORE
CHIMNEY
SECTIONS

13
least (2) 8-penny nails or (2) #8, 1-1/2 screws.
Do not add more Chimney Sections until
the Elbows are supported. Be sure that the
chimney remains vertical. If there is more than
one Chimney Section between the Elbows,
install a second Elbow Strap around the joint of
the two Chimney Sections (Fig 15).
EXTENDED ROOF BRACKET
INSTALLATION
If the chimney extends more than 5 feet
above the rooine, an Extended Roof Bracket
must be installed at every 5-foot increment
of chimney height above the rooine, leaving
no more than 5 feet of chimney extending
above the last pipe bracket. The Extended
Roof Bracket consists of the Pipe Band, the
Adjustable Legs, and the Roof Brackets.
1. Mount Pipe Band: Slip the Pipe Band
around the chimney and secure by tightening
the nut and bolt.
2. Attach the Legs: The Adjustable Legs
of the assembly will adjust from 67” to 114”.
Secure one end of each Leg to the Pipe Band
using the nuts and bolts included (2 per Leg).
Position the Adjustable legs so they form
approximately a 60° angle with the chimney,
and with each other (Figures 16 and 17). Be
sure that there is at least 3” of overlap between
the top and bottom halves of the Adjustable
Leg. In order to secure Legs in proper
position, there is a hole provided in the outer
leg where the outer and inner halves overlap.
Use a 1/4” drill bit to drill through the inner leg
at that location. Use the nut & bolt provided to
pin the Adjustable Legs in position.
3. Install Roof Brackets: Mount the two
Roof Brackets where each of the Adjustable
Legs meets the roof, using (4) 1” roong nails
or screws per bracket. Seal the nail heads
carefully with a non-hardening, waterproof
sealant. Attach the bottom end of the
Adjustable Legs to the Roof Brackets using the
nuts & bolts provided.
ROOF SUPPORTED
INSTALLATIONS
There are two types of Roof Supported
Installations: (1) Using a Square Ceiling
Support Box, Reduced Clearance Support
Box, or CAS Ceiling Support; and (2) Using a
Roof Support.
(1) For a Square Ceiling Support Box,
Reduced Clearance Support Box, or CAS
Ceiling Support installation, make sure that
the square box portion of the Support Box can
extend at least 2” below the low side of the
nished ceiling (Fig 19). If the CAS Ceiling
Support is used, refer to the DuraTech CAS
Figure 16
Figure 17
PIPE BAND
AROUND
CHIMNEY
SECTION ADJUSTABLE
LEGS ADJUST
FROM 67 TO
114 INCHES
EXTENDED ROOF
BRACKET ASSEMBLY
CHIMNEY CAP
EXTENDED ROOF
BRACKET
ADJUSTABLE LEGS
MUST USE EXT.
ROOF BRACKET IF
OVER 5 FT

14
Figure 18
Figure 19
SQUARE PORTION
OF SUPPORT BOX
NEEDS A MIN OF 2
INCHES CLEARANCE TO
FINISHED CEILING
18 INCH MIN CLEARANCE
FOR SINGLE-WALL
STOVEPIPE
CAP ADJUSTABLE
FLASHING
CHIMNEY
SECTION
STORM
COLLAR
CHIMNEY
SECTION
FRAMED
OPENING
SQUARE
CEILING
SUPPORT BOX
OR REDUCED
CLEARANCE
SUPPORT BOX
CHIMNEY
SECTION
CHIMNEY
SECTION
CAP ADJUSTABLE
FLASHING
CHIMNEY
SECTION
STORM
COLLAR
SQUARE
CEILING
SUPPORT BOX
OR REDUCED
CLEARANCE
SUPPORT BOX
CHIMNEY
SECTION
Installation Instructions for directions on how
to install the remainder of the Combustible Air
System. The Support Box must remain level,
and the top edge of the box must cover the
edge of the roof’s decking material. Square
Ceiling Support Boxes are available in 11-inch,
24-inch, and 36-inch heights. The Reduced
Clearance Support Box is available in 24”
length for 6” diameter chimney only. Mobile
home chimney installations are roof supported.
Do not seal openings in ashing.
1. Place Appliance: Place the appliance in its
proper location, referring to the manufacturer’s
instructions as to allowable distances from
combustibles, etc.
2. Cut Openings: Cut a roof opening in your
desired location, just as in a Ceiling-Supported
Installation (Steps 1 through 5). If a separate

15
ceiling and roof exists, as shown in Figure
18 (Low Attic), rst cut and frame a ceiling
opening as described in Ceiling-Supported
Installations (Step 2). Refer to Table 2 for
clearance and framing specications. If it is
desired to install through a cathedral ceiling
(Fig 19), then the hole is cut in the roof.
3. Install Support Box: Slip the Square
Support Box, Reduced Clearance Support
Box, or the CAS Ceiling Support into the
framed opening so the square portion projects
at least 2 inches below the nished ceiling and
rafters (bottom of round portion is 5” below),
and extends above the ceiling to framing or
decking materials to which it can be nailed.
Level the Support Box, and slit the corners
to the rooine where they extend beyond it.
Bend the aps (created by the slitting) ush
with the roof, and nail the Support Box to the
roof or framing with at least three (3) 8-penny
nails, or (3) 1-1/2”, #8 screws, per side (Fig
20). Be sure to keep the Support Box level.
Screw the trim sections into the ceiling (Fig 6).
4. Complete Installation: Refer to Steps 7,
9 & 10 in the Ceiling Supported Installation
section to complete the Roof Supported
installation.
Figure 20
Figure 21
(2) A Roof Support is also used in installations
where there is a cathedral ceiling, and a
Square Ceiling Support is not desired. The
Roof Support allows the DuraTech chimney
to come down into the room below the level
of the ceiling (Fig 21). The Roof Support can
support a maximum of 45 feet of DuraTech
Chimney total, and maximum of 20 feet below
the support. If a taller stack of DuraTech
Chimney is required, you must use a Square
Ceiling Support Box instead.
1. Cut and frame opening to provide a
minimum 2” clearance on all sides of the
chimney pipe. Note: Opening in nished
ceiling should be circular/oval in order for it to
be covered by Trim Collar.
2. Bolt on the Roof Support Brackets to
the Roof Support Band using the supplied
ROOF SUPPORT
TRIM COLLAR
FINISHING COLLAR
DURABLACK
SLIP CONNECTOR
USE 4 NAILS (OR
SCREWS) ON
EACH SIDE OF
SUPPORT
ROOF SUPPORT
(SUPPORT
BRACKETS AND
BAND)
SECURE ROOF
SUPPORT BAND TO
CHIMNEY USING
4 SHEET METAL
SCREWS
TIGHTEN BOLT
ON ROOF
SUPPORT BAND.

16
hardware. Attach the Roof Support Brackets
to roof using (4) 8 penny nails or (4) #8, 1-1/2”
screws per side (Fig 21).
3. Determine how much DuraTech Chimney
will be extending into the room (minimum of
3” below the ceiling). Be sure to maintain the
proper clearance to combustibles (walls and
ceilings) for the connector pipe. Once you have
identied the proper height for your installation,
attach the of the Roof Support Band to the
Chimney Section by tightening the Bolt, and
secure it by using (4) supplied sheet metal
screws.
4. Attach desired length of Chimney Sections
above and below the roof level (max. of 45’
total, 20’ below the support). To transition to the
Connector Pipe, attach the Finishing Collar by
twist locking it to the bottom section of DuraTech
Chimney.
5. Slide Trim Collar over the DuraTech Chimney
and attach the Trim Collar to the ceiling using
(4) 1-1/4” screws provided (Fig 21).
6. Refer to Steps 10 & 11 in the Ceiling
Supported Installation section to complete the
Roof Supported installation.
Alternative Installation Location for Roof
Support: The Roof Support may be used at the
bottom of a Chimney installation (Fig 22). This
may be useful for some basement installations.
Maintain a minimum of 2” clearance to
combustibles at all times. The DuraTech
Chimney needs to extend a minimum of 3”
below the nished ceiling or exposed framing
members. Please note that you cannot extend
the chimney all the way to the appliance - you
must have some connector pipe.
1. Cut and frame opening to provide a minimum
of 2” clearance on all sides of the chimney.
Be sure to maintain the proper clearance to
combustibles for the connector pipe.
2. Bolt on the Roof Support Brackets to
the Roof Support Band using the supplied
hardware. Attach the Roof Support Brackets
to oor using (4) 8 penny nails or (4) #8, 1-1/2”
screws per side (Fig 22).
3. Determine how much DuraTech Chimney
will be extending into the room (minimum of
3” below the framing), and attach the of the
Roof Support Band to the Chimney Section by
tightening the Bolt, and secure it by using (4)
supplied sheet metal screws (Fig 21 & 22).
4. Install a Firestop Radiation Shield below the
nished ceiling or framing members. Trim the
‘tube’ portion of the Firestop Radiation Shield
as needed if it interferes with the Roof Support
Installation.
5. Follow steps 4, 5 & 6 for the Roof Support.
TEE-SUPPORTED INSTALLATIONS
Tee-Supported installations are used when
passing through a wall to an outside chimney.
The Tee Support can hold a maximum of
50-feet of DuraTech Chimney without the Tee
Support Straps, or70-feet with use of Tee
Support Straps. The Tee Support and Wall
Straps are adjustable, allowing from 2” - 6” of
clearance between the chimney and the wall,
Figure 22
FLOORING
DURATECH CHIMNEY
PIPE
ROOF SUPPORT
MIN OF 3” BELOW
CEILING OR
EXPOSED FRAMING
FIRESTOP
RADIATION SHIELD
(TRIM RADIATION
SHIELD IF NEEDED
TO AVOID ROOF
SUPPORT)
FRAMING
MEMBERS
(ALL SIDES)

17
as needed to t your installation. There are
two options when installing a Tee-Supported
installation: the Tee Support above the Tee, or
the Tee Support below the Tee. The required
parts and general conguration are as shown
in Figures 23, 24, 25 and 26.
1. Place Appliance: Position the appliance
according to the manufacturer’s instructions. It
is a good idea to try to position the appliance
so it will allow the chimney to line up centered
between studs.
2. Locate, Cut & Frame Opening: Determine
the location where the chimney will pass through
the wall. The chimney should pass through
the wall, centered between two studs. The
height of the penetration can be determined
by positioning sections of stove pipe until you
have the desired conguration (refer to the
appliance manufacturer’s installation instructions
for restrictions on stove pipe). Cut and frame
an opening in the inner and outer walls at this
location. Refer to Table 2 for the appropriate
framing dimensions.
3. Install Wall Thimble: The Wall Thimble
is two-piece component which includes the
Interior half and the Exterior half. On the
outside wall, install the back portion of the Wall Figure 23
Figure 24
Thimble. Center the back portion of the Wall
Thimble (with shield inside wall) in the framed
opening of the outside wall. Be sure to seal
the ange of the Wall Thimble around the wall
by using a non-hardening waterproof sealant.
Attach the back portion of the Wall Thimble to
the outside wall using at least (4) 8-penny nails
or (4) #8, 1-1/2” wood screws. There must be
MIN 6 INCHES
CLEARANCE
BETWEEN CAP AND
CHASE TOP
ACCESS DOOR
FOR CLEANING
CHASE TOP
FLASHING
FRAMED EXTERIOR
ENCLOSURE
TYPICAL THRU-
THE-WALL TEE
SUPPORTED
INSTALLATION
FINISHING COLLAR
TEE CAP
CHIMNEY SECTION
CHIMNEY TEE
USE 8 PENNY NAILS OR #8, 2 1/2” WOOD
SCREWS. USE 4 FOR EACH SUPPORT
LEG.
TEE BRANCH (MUST
PENETRATE A MINIMUM
OF 6 INCHES INTO ROOM)
WALL THIMBLE
ASSEMBLY
TEE SUPPORT IS ADJUSTABLE TO
ALLOW FROM 2” - 6” CLEARANCE FROM
CHIMNEY TO WALL.

18
a continuous shield within the wall. If the two
halves of the Wall Thimble do not overlap, a eld-
fabricated extension constructed out of 26-gauge
galvanized or stainless steel is needed.
4. Install Tee Support: Install the Tee Support
on the outside wall. Position Tee Support so
that the chimney Tee will be centered inside
the Wall Thimble (Figs 24, 25, & 26). The Tee
Support may be installed either above the Tee or
below the Tee (within one pipe section), as seen
in Figure 26. The Tee Support can support up
to 50-feet of chimney by itself, or up to 70-feet
of chimney if the Tee Support Straps are used
(Fig 24, 26). Important: Verify that Tee Support
is level, and secure the leg brackets of the Tee
Support to the wall using (4) #8, 2-1/2” screws for
each side. Slide support base over leg brackets
to adjust for desired clearance to wall, and secure
by tightening bolts. (Figs 26 & 27).
5. Install Tee and Cleanout Chimney
Figure 25
Figure 26
INSTALLATION
WITH TEE BELOW
TEE SUPPORT
(SHOWN WITH
LEG BRACKETS
MOUNTED BELOW
SUPPORT PLATE)
USE 1/2”
SHEET METAL
SCREWS TO
SECURE BAND
TO SUPPORT
BASE
USE (4) 1/2”
SHEET METAL
SCREWS TO
SECURE BAND
AROUND
CHIMNEY
WALL THIMBLE
COVER PLATE
FINISHING
COLLAR
TEE BRANCH
(MUST EXTEND AT
LEAST 6 INCHES
INTO ROOM)
CHIMNEY TEE
BACK OF WALL THIMBLE
(SECURE WITH 4 NAILS
OR 4 SCREWS)
CLEANOUT CAP
INSTALLATION WITH TEE
BELOW TEE SUPPORT
(SHOWN WITH LEG
BRACKETS MOUNTED
ABOVE SUPPORT
PLATE)
TEE SUPPORT WITH
LEG BRACKETS
MOUNTED ABOVE
SUPPORT PLATE CAN
SUPPORT A MAXIMUM
OF 50-FEET OF
CHIMNEY.
TEE SUPPORT MAY BE
INSTALLED WITH LEG BRACKETS
ABOVE OR BELOW SUPPORT
PLATE AS SHOWN
8-PENNY NAILS OR #8, 2 1/2”
WOOD SCREWS, 4 PER SIDE
ADJUSTABLE TEE
SUPPORT ALLOWS 2”-6”
CLEARANCE TO WALL
ADJUSTABLE WALL STRAP,
ALLOWS 2”-6” CLEARANCE
TO WALL
8-PENNY NAILS OR #8,
2 1/2” WOOD SCREWS,
2 PER SIDE

19
Section: Twist lock the Tee onto a desired
length of Chimney to be used as the cleanout
section. Use only one chimney section (any
length) to attach to bottom of the Tee. Tighten
support band around chimney section at
proper height to insure that Tee is centered
through Wall Thimble (Fig 25 & 26). Use the
1/2” sheet metal screws provided to insure
a tight connection between support band
and chimney section. Connect support band
to support base using the 1/2” sheet metal
screws provided (Fig 26). Twist lock Tee Cap
into bottom of Chimney Cleanout section.
6. Install Branch onto Tee: From inside
the house, attach the Chimney Branch up
to 24” chimney section, depending on wall
thickness, positioned horizontally used to pass
through the wall) to the Tee by twist locking it
clockwise. Important: The Chimney section
used to penetrate through the wall must extend
at least 6” into the room (Fig 25 & 27). Use
high-temperature sealant (500ºF) to seal
between the Wall Thimble and the Chimney on
the outer wall.
7. Install Cover Plate and Finishing Collar:
After the Chimney Branch is secured in place
(penetrating at least 6” into the room), slide
the Cover Plate over the Branch and attach
it to the framing using (4) 1-1/4” long, round
head wood screws. Be sure that the Branch
is centered in the opening of the Cover Plate.
Twist lock the Finishing Collar on to the
female end of the Chimney Branch by twisting
clockwise.
8. Complete Chimney: Attach the Chimney
Sections as in Step 7 in the Ceiling Supported
Installation section. Secure the chimney to
the wall with Wall Straps at a minimum of
8-foot intervals and maintain at least 2 inches
of clearance to combustible materials. The
Wall Straps are adjustable to allow from 2”- 6”
clearance to combustibles. Slip the Wall Straps
around the chimney, tighten the bolts, adjust
the clearance, and fasten the Wall Straps to
the wall with (4) #8, 1-1/2” long wood screws.
Once the chimney is at the minimum height
specied in Figure 1, attach the Chimney Cap
onto the top of the chimney by holding it by
the collar and twist locking it clockwise onto
the Chimney Pipe. If the chimney penetrates
an overhang, frame for at least 2 inches of
clearance, and install Flashing and Storm
Collar as described in Steps 9 & 10 for Ceiling
Supported Installations. Another option is to
cut away the overhang for a 2-inch clearance
(Fig 28). If the chimney extends more than 5
feet above the top Wall Strap or Flashing, use an
Extended Roof Support Bracket.
9. Install Chase Top Flashing: It is
recommended that a Tee Supported Chimney be
enclosed in a chase. If a chase enclosure has
been constructed, you can either use a standard
at-roof ashing, or you can use a Chase Top
Figure 27
EXTENDED ROOF
SUPPORT BRACKET
ADJUSTABLE WALL
STRAP
ADJUSTABLE
FLASHING
2 INCHES MIN
FRAMED CHASE
ADJUSTABLE TEE
SUPPORT
ACCESS DOOR
FOR CLEANING
2 INCHES MIN
6 INCHES MIN
INTO ROOM

20
Flashing. Using a Chase Top Flashing allows
for a lower prole for the chimney. The Chase
Top Flashing has an opening that is 3” larger
in diameter than the DuraTech Chimney. If the
Chase Top Flashing can t over your chase
enclosure as required (Fig 29) then install as
directed, or trim as needed. However, if the
Chase Top Flashing is smaller than your chase
enclosure, you will need to provide a galvanized
sheet capable of covering your chase and
overhanging the sides by 1/2 - 3/4 inch. Attach
the Chase Top Flashing to the galvanized sheet
using appropriate sheet metal screws and non-
hardening waterproof sealant. Use the Chase
Top Flashing Spacers to allow the proper air-gap
clearances on the galvanized sheet. The Chase
Top Flashing Spacers are available to insure
that the proper air-gap is maintained. Figure 29
displays in some detail, how these air gaps are
established using the Spacers and Chase Top
Flashing. Secure the Chase Top Flashing to the
chase using a sufcient number of #8, 1-1/2”
wood screws, being careful to insure the air
Figure 28
Figure 29
ALLOW MIN OF 2 INCHES
AIR SPACE ON ALL SIDES
2 INCHES MIN
2 INCHES MIN
ALLOW 1 INCH AIR
GAP BETWEEN STORM
COLLAR AND CHASE TOP
FLASHING
1/2 INCH AIR SPACE
ESTABLISHED BY
SPACERS
6 INCH MIN CLEARANCE
BETWEEN BOTTOM OF
CAP AND CHASE TOP
FLASHING
1/4 INCH
AIR
SPACE
CHIMNEY CAP STORM COLLAR
CHASE TOP
FLASHING
CHIMNEY
SECTIONS
SPACER
1/2 INCH
FRAMED CHASE
ENCLOSURE
1/4 INCH