DuraVent DuraTech 5-8 User Manual
Installation Instructions
All-Fuel Chimney System
5” to 8” diameter
DuraTech
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:
We welcome any comments, ideas, input or
complaints regarding matters pertaining to our
DuraVent products.
If you are searching for tech support or product
information, please phone us at 800-835-4429.
Or email us at:
techsupport@duravent.com
LISTED
MH7399
ALL-FUEL CHIMNEY SYSTEM, 5” TO 8” DIAMETER
For the most up-to-date installation instructions, see www.duravent.com
CONTENTS
CLEARANCES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
PERMITS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
DURATECH CHIMNEY APPLICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
INSTALLATION NOTES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
CHIMNEY HEIGHT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
CHIMNEY ENCLOSURE REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SUPPORT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
METHOD #1: CEILING SUPPORTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
OFFSET ELBOW INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
EXTENDED ROOF BRACKET INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . .13
METHOD #2: ROOF SUPPORTED INSTALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
METHOD #3: TEE-SUPPORTED INSTALL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
METHOD #4: MASONRY FIREPLACE INSTALL . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
METHOD #5: ZERO-CLEARANCE FIREPLACE INSTALL. . . . . . . . . . . . . . . . . . 21
ADJUSTABLE CHIMNEY LENGTH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
CHIMNEY MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
DuraTech
3
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 Ofcial or Fire
Ofcial regarding permits, restrictions, and
installation inspections in your area.
DURATECH CHIMNEY
APPLICATIONS
DuraTech Chimney (5”-8” Dia) 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 5”-8”
Chimney can be used with wood stoves,
replaces, reboxes, furnaces, boilers, 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.
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 FIle MH7399.
INSTALLATION NOTES
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 modied parts. Follow
the appliance manufacturer’s instructions to
determine: chimney diameter, clearances
between combustible materials and your
heating appliance, and to ensure maximum
system efciency and safety. Connect only
one appliance per chimney. Never choose
a chimney with an inside diameter smaller
than your appliance’s outlet. 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.
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.
Care must be taken to avoid overring, which
can damage the appliance, stovepipe and
chimney system.
Mobile Homes: Please read the appliance
manufacturer’s instructions and safety manual
carefully. Not all appliances are listed for use
in mobile homes.
4
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
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.
CHIMNEY PLACEMENT
When deciding the location of your chimney,
try to avoid modications to roof beams and
other structural components of the building.
CHIMNEY ENCLOSURE REQUIREMENTS
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,
2 FT MIN ABOVE HIGHEST
POINT OF ROOF WITHIN
10 FT
3 FT MIN
ABOVE
ROOF
10 FT
Figure 1
ATTIC
INSULATION
ATTIC /
UNOCCUPIED
SPACE
OCCUPIED
SECOND
FLOOR
FIRST
FLOOR
SHIELD
FIRESTOP
RADIATION
SHIELD
(INSIDE)
ENCLOSURE
MUST HAVE 2
INCHES OF
CLEARANCE
BETWEEN
CHIMNEY AND
WALL
SUPPORT
BOX
Figure 2
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
5
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 (Fig.26,27).
TABLE 1: Framing Dimensions
Chimney Diameter
5” 6” 7” 8”
CATHEDRAL CEILING
SUPPORT BOX
FLAT CEILING
SUPPORT BOX
ROUND CEILING
SUPPORT BOX
FIRESTOP RADIATION
SHIELD
WALL THIMBLE 11- 1/4” 12-1/4” 13-1/4” 14-1/4”
CAS CEILING
SUPPORT
CAS WALL THIMBLE NA 12-1/4” NA 14-1/4”
REDUCED
CLEARANCE
SUPPORT BOX
11-1/4” 12-1/4” 13-1/4” 14-1/2”
11-1/4” 12-1/4” 13-1/4” 14-1/2”
11-1/4” 12-1/4” 13-1/4” 14-1/4”
11-1/4” 12-1/4” 13-1/4” 14-1/4”
NA 12-1/4” NA 14-1/2”
NA 10-1/4” NA NA
TABLE 2: Chimney Support
DURATECH SUPPORT COMPONENT
ADJUSTABLE ELBOW STRAP EA ELBOW/PIPE
ADJUSTABLE WALL STRAP N/A - USE EVERY 8’ MIN
SUPPORT BOX (SQUARE OR
ROUND)
TEE SUPPORT 60-FT
EXTENDED ROOF BRACKET N/A
EXTENDED WALL SUPPORT 20-FT
RE-SUPPORT 20-FT
ROOF SUPPORT 30’ TOTAL, 10’ ABOV E
5” AND 6” DIA 7” AND 8” DIA
UNIVERSAL
SUPPORT
BAND
SPACER
CHIMNEY HEIGHT
SUPPORTED 5”-8” DIA
60-FT
SUPPORT REQUIREMENTS
There are two “styles” of support connection
to the chimney pipe: Dedicated dia supports,
and Universal supports shown in Fig.3, 4.
For Universal components, the spacer is
discarded for 5”-6” Dia. Table 2 details the
chimney height supported by the various
components and must be followed throughout
this instruction, this data applies to both styles.
Items in Table 2 noted N/A are not load bearing
components.
6
UNIVERSAL
EXTENDED
WALL SUPPORT
Figure 3
UNIVERSAL
RE-SUPPORT
Figure 4
BAND-BRACKET CONNECTIONS
For Universal components, use the carriage
bolt through the band and through the leg.
Use (1) at washer, (1) locking washer, and (1)
nut per side to secure to carriage bolt (Fig.5).
Ensure carriage bolts are directly across from
each other.
CARRIAGE BOLT
FLAT WASHER
LOCKING WASHER
NUT
UNIVERSAL
SUPPORT BAND
Figure 5
MOUNTING
HARDWARE- #8
WOOD SCREWS
WITH WASHER
WALL SUPPORTS/RE-SUPPORTS
Wall Supports, Re-Supports, and Tee Supports
can be used interchangeably (Fig.6) to support
the chimney on vertical runs.
STEP-BY-STEP DIRECTIONS
There are ve general types of DuraTech
Chimney installations- Review the step-by-step
directions before beginning your installation.
1.Ceiling-supported (p.7)
2.Roof-supported (p.14)
3.Tee-supported-through-the-wall (p.16)
4.Masonry Fireplace (p.20)
5.Zero-Clearance Fireplace (p.21)
METHOD 1: 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 1 for specic 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. (Fig.7 and 8).
SQUARE SUPPORT
BOX
ROUND SUPPORT
BOX- SQ TRIM
EXTENDED
WALL SUPPORT
Figure 6
JOISTS & FRAMING
PER TABLE 1
SQUARE MUST
EXTEND MIN 2” BELOW
FINISHED CEILING
(MIN POINT IF ANGLED)
ROUND MUST EXTEND
MIN 3” BELOW
FINISHED CEILING
Figure 7
7
REF FIG. 7 FOR MIN
DISTANCE BELOW
CEILING FOR
SUPPORT USED
18 INCHES
MINIMUM FOR
SINGLE WALL
STOVEPIPE
CHIMNEY CAP
STORM
COLLAR
ROUND SUPPORT
BOX
Figure 8
ADJUSTABLE FLASHING
CHIMNEY SECTIONS
ATTIC INSULATION SHIELD
FRAMED OPENING
ROUND TRIM COLLAR
3. Install Support Box: For installation into a
at ceiling, there is the option of the Round
Support Box (Round or Square Trim Collar),
Flat Ceiling Support Box, Square Ceiling
Support Box, Reduced Clearance Support
Box, or the Combustion Air System (CAS)
Ceiling Support Box. 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 system. The Flat
Ceiling Support Box is primarily used for Oil
Appliances and comes unpainted.
For the Round support box, the trim mounts
ush to the ceiling with the bottom protruding
a min of 3” below the ceiling (Fig.7). For the
Square support box, the square face must
protrude a min of 2” below the ceiling (Fig.7).
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. After the Support Box
is mounted, secure the Trim Collar (round or
square) to the framing members using the (4)
1” long, round-head wood screws provided
SQUARE SUPPORT BOX
WITH TRIM FRAME IN
PLACE
MINIMUM OF
2” BELOW
CEILING
WOOD SCREWS ARE
REQUIRED
Figure 9
(Fig.9). 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” lower (round portion is
then an additional 3” lower) than the nished
ceiling at the lowest side of the penetration
(Fig.9). 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
8
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