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How To Plan Your Chimney Installation DuraPlus®DuraPlus®
All-fuel, triple-wall
chimney system.
UL 103 HT.
The chimney system allows your stove or fireplace to exhaust flue gases while a draft creates the draw that pulls fresh combustion air into the stove. A well balanced system provides an even, hot fire when it has good draft. The draft suction keeps smoke from coming into the room. Insulation in the chimney pipe is important because it helps keep the exhaust hot until it is expelled outside. Heat in the chimney makes draft, which pulls in more combustion air. This creates a hotter fire, delivering more heat to the chimney and resulting in more draft. The size of the flue is important for the system to work efficiently. The appliance manufacturers installation instructions will indicate how to size the flue to match the stoves flue collar.
Stovepipe connects to the stove. It is the usually black interior pipe that transitions from the stove to the chimney pipe with an adapter. It is not insulated and cannot penetrate ceilings or walls. Chimney pipe is an insulated pipe that is rated to pass through walls and ceilings. In addition to the chimney pipe, supports to hold the system in place and shields to protect areas from combusting are needed for the system. The flashing, storm collar and chimney cap are required to seal the system from moisture penetration.
How It Works
Chimney Adapter
DuraBlack Stovepipeor DVL Stovepipe
Stove Adapter
Chimney Cap
ExtendedRoof BracketStorm Collar
Flashing
Elbow Strap
Elbow
AtticInsulation Shield
FirestopRadiation Shield
Wall Strap
Chimney Pipe
SecondFloor Chase
Ceiling Support
DuraPlus
1 DVL or DuraBlack Stovepipe
2 Ceiling Support Box
3 Wall Thimble
4 DuraPlus Chimney
5 Attic Insulation Shield
6 Roof Flashing
7 Storm Collar
8 Chimney Cap
9 Elbow
10 Elbow Strap
11 Tee with Cap
12 Tee Support Bracket
13 Wall Strap
14 Firestop Radiation Shield
15 Snap-Lock Adapter, DVL/DuraBlack Chimney Adapter, DuraBlack Slip Connector
16 Extended Roof Bracket
17 DVL or DuraBlack Chimney
Adapter
18 DVL or DuraBlack Tee
19 DVL or DuraBlack Elbow
20 Chase Top Flashing
21 Anchor Plate
Manufactured Home
*DVL stovepipe required for
this installation
Through-the-Wall
Cathedral Ceiling
Roof Support
Fireplace
(new or retrofit)
Oil Furnace
1719
18
8
7
4
4
5
1
2
6 7 8
4
4
20
21
Fireplace
(New or retrot)
Cathedral CeilingRoof Support
15
1
6
8
4
7
2
Attic Offset
6
8
2
1
5
9
6
4
7
15
10
Attic Offset
4
6
4 8
7
Through-the-Wall
12
11
13
3
1
19
15
Oil Furnace
Step 1.Measure the diameter of the appliance flue outlet. Select the
chimney and either DVL or DuraBlack connector stovepipe with the
same size diameter as the appliance flue outlet.
Step 2.Measure the roof pitch. For example, a 6/12 pitch has a vertical rise of 6” over a horizontal distance of 12”. Select the appropriate flashing.
Step 3.
Determine the minimum chimney height above the roof line. Building codes require a minimum of 3’ above the roof penetration, and at least 2’ higher than any portion of a building within 10’. See Figure 1.
Step 4.
If an offset is required to avoid rafters or other obstructions, measure
the horizontal distance required and the vertical height available.
Both 15° and 30° elbows are available. Please note that 45° elbows
are not allowed in the United States. At least one Elbow Strap is
required for each offset. Elbow Straps ensure adequate support.
Step 5.
Determine the total length of chimney and stovepipe required
for the installation. To calculate the installed per length of 6”-8”
DuraPlus chimney pipe, subtract 1 1⁄2” per joint. Subtract 1 1⁄4” per
joint of DuraBlack stovepipe. Subtract 1 1⁄2” per joint of DVL stovepipe.
Minimum chimney height, at sea level of straight vertical chimney is
10’ to 15’ above the appliance outlet. Higher elevations, or the use of
elbows or a tee, will require approximately 30% to 60% more height
to provide for an adequate draft.
Figure 1
10'3 FT. MINIMUM HEIGHT FROM ROOF PENETRATION
2 FT. MINIMUM ABOVE ANY PORTION OF BUILDING WITHIN 10 FT.
MINIMUM CHIMNEY HEIGHT REQUIREMENT
1
Manufactured Home*DVL stovepipe required for this installation
17
6
4 8
7
2
1 *
• A DVL/DuraBlack Chimney Adapter or
DuraBlack Slip Connector must be used
when connecting DVL or DuraBlack
stovepipe to a Ceiling Support or Wall
Thimble. A Snap-Lock Adapter must be
used when attaching snap-lock stovepipe
to DuraPlus.
• A Wall Thimble must be installed with an
appropriate section of chimney pipe for all
horizontal through-the-wall installations. To
accommodate thicker walls a wall thimble
extension can be field fabricated.
• An Attic Insulation Shield must be used in
all installations that pass through an attic,
regardless of whether the attic is insulated
or not. If chimney is enclosed in a chase in
the attic space, an Attic Insulation Shield is
not required.
• A Firestop Radiation Shield must be used
when a chimney passes through a floor or
ceiling without a Ceiling Support Box.
Professional Technical Help
DuraVent prides itself on providing the best customer
service and technical support in the industry.
Our Customer Support Team is available to answer
technical questions.
Monday – Friday
5:30am – 4pm Pacific | 8:30am – 7pm Eastern
Tel: 800-835-4429
Fax: 707-446-4740
customerservice@duravent.com
Contact
Leaders in-Venting Innovation™
800.835.4429 | 707.446.4740 Fax | www.duravent.com
L127_810007487_Brochure_DuraPlus_03-18-20_V4
Product List
DuraPlus
DuraPlus is designed to stay cool on the outside, to
provide a hot draft on the inside, to boost stove efficiency,
and to provide for a fire-safe design that protects both
the chimney and the building. This triple-wall chimney
features two insulating layers (ceramic blanket, plus air
space). The ceramic blanket insulation is held securely
in position, eliminating hot spots common with loose-
fill type insulations. In the event of a creosote fire, the
compressible blanket insulation permits the chimney liner
to expand outwardly in a radial direction.
Designed for normal, continuous operation at 1000° F flue
gas temperatures, DuraPlus is subjected to rigorous and
stringent HT requirements of the UL standard, including
one hour at 1400° F, plus three ten minute chimney fire
tests at 2100° F.
What Makes Us Different
From The Rest?
Applications
DuraPlus Chimney is a triple-wall, all-fuel chimney for
use with wood stoves, fireplaces, furnaces, boilers,
stoves, ranges, water heaters, or other appliances
fueled by wood, oil, coal, or gas.
Materials and Construction
.016” 430 stainless steel outer wall or .018”
galvanized steel outer wall.
.018” aluminized steel intermediate liner.
.016” 430 stainless steel inner liner.
Insulated layers of ceramic blanket plus ventilated
air space. Locks tightly with a precision
twist-lock connection.
Clearances
2” clearance to combustibles.
Diameters
6” - 8”.
Listings
UL Listed to UL 103HT (MH7399).
DuraPlus Through the Ceiling Kit
Kit includes: DVL/DuraBlack Chimney Adapter, Snap-
Lock Adapter, 11” Square Ceiling Support Box with Trim,
Adjustable Flashing 0/12-6/12, Chimney Cap, Storm Collar,
and Attic Insulation Shield. Only available in 6” diameter.
Pipe not included. Can be used for flat or vaulted ceiling
installations. Use for typical through-the-roof installations.
DuraPlus Manufactured Home Kit
Kit includes: DVL/DuraBlack Adapter, 24” Square Ceiling
Support Box with Trim, Adjustable Flashing 0/12-6/12,
Chimney Cap, Storm Collar, and (2) 24” DuraPlus Chimney
Pipe (galvanized). Only available in 6” diameter. Can be used
for cathedral ceiling installations. Use for manufactured
home through-the-roof installations.
DuraPlus Through-The-Wall KitKit includes: DVL/DuraBlack Chimney Adapter, Snap-Lock Adapter w/ Trim, 9” DuraPlus Chimney Pipe (galvanized), Wall Thimble, Tee w/ Cap, (2) Wall Strap, Tee Support Bracket, and Chimney Cap. Only available in 6” diameter. Use for through-the-wall installations.
Chimney Pipe
6" to 8" diameters. Stainless steel inner walls. Outer-casing in
galvalume or stainless steel.
Elbow Kit
Kit includes: 2 Elbows and 1 Elbow Strap. 15° or 30° elbows
swivel 360° at base.
Elbow StrapUse to prevent excessive weight on the elbows by supporting the weight of the chimney. Required to be installed between two elbows in offset installations.
Round Ceiling SupportSupports chimney pipe and provides a positive connection between support box and chimney with a built-in twist-lock. Supports up to 35’ of DuraPlus Chimney. Includes trim collar.
Square Ceiling Support Box
Supports up to 35 ft. of chimney. Use with flat, vaulted or
cathedral ceilings; in 11", 24" or 36" lengths. Includes
trim collar.
Flat Ceiling Support Box
Supports chimney pipe and provides a positive connection
between support box and chimney with a built-in twist-lock.
Designed for installation in flat ceilings only. Supports up to
35’ of DuraPlus chimney pipe.
Wall Thimble
For passing chimney through a wall. Adjusts from a
minimum of 4 3⁄4” to a maximum of 7 3⁄4” wall thickness, and
fits between standard wall studs. To accommodate thicker
walls, the telescoping pieces can be extended up to 16” with
a field-fabricated extension installed.
Tee w/ CapFor through-the-wall installations. The tee clean-out cap is removable for easy chimney cleaning or inspection.
Tee Support Bracket
Use to support the Tee; suspended from a wall. Supports up
to 35' of DuraPlus Chimney. Starter Section built in.
Adjustable Wall Strap
Use in interior or exterior installations to support and to
stabilize the chimney while assuring a 2” clearance. Wall
straps are required every 4' on exterior of building. Adjusts
2”-6” from wall.
Wall StrapUse in interior or exterior installations to support and to stabilize the chimney while assuring a 2” clearance. Wall straps are required every 4’ on exterior of building only.
Base PlateUse to adapt on a zero-clearance fireplace when using DuraPlus directly off the unit. Starter Section built in.
Transition Anchor Plate
Provides easy installation of DuraLiner to DuraPlus chimney
when used with a slip connector and hanger.
Starter Section
Use only when converting from DuraLiner to DuraPlus and
the DuraPlus Chimney is going to be enclosed in a chase.
Firestop Radiation Shield
Use in ceiling/floor penetrations when a ceiling support is not
used. Not required when passing through the roof. Fits on
underside of ceiling and adjusts to cover framing.
Attic Insulation Shield
Required for installations that pass through an attic to
prevent insulation and debris from accumulating near the
chimney. Fits over Firestop Radiation Shield or a support box.
Close Clearance ShieldUse in installations where a 7” or 8” DuraVent chimney system passes through a roof opening with less than the normal 2” minimum clearance to roof trusses or rafters.
Roof Flashings
Use to weather proof the penetration of chimney pipe
through the roof. Storm Collar required. Select roof flashing
based on pitch of roof. Also available in dead soft aluminum.
Storm Collar
Required with DuraPlus flashing to create a weatherproof
penetration through the roof deck.
Extended Roof Bracket
Use to support the chimney when it extends more than 4’
above the roof. Provides stability to chimney against wind
and snow.
Chimney Cap
Required where chimney pipe terminates above the roof line.
Removable screws allow for cleaning of the chimney and
spark arrestor screen. Made of stainless steel.
Snow Splitter
Use to divert snow around chimney, vent, and roof flashing.
Constructed of paintable galvanized material.
Stainless steel
inner and
outer walls
Two insulating layers
(ceramic blanket plus air
space) keeps the exterior
cool, while ensuring high
flue gas temperatures for
optimum draft performance
No locking bands
or mechanical
fasteners required
Limited
Lifetime
Warranty
Triple-wall chimney for
ultimate performance
and safety
Locks tightly
with precision
twist-lock fittings
DuraPlus®