DuraVent DDW Double-Wall User manual

Duravent Double-Wall®Stovepipe
Interior close clearance stovepipe for
connecting woodstoves to chimney
ONLY AVAILABLE IN CANADA
DDW®

2Duravent | www.duravent.com
Double-Wall Stovepipe
Duravent Double-Wall Stovepipe
SAFE, DURABLE, AND EFFICIENT
With the Double-Wall Stovepipe, Duravent has designed a product
that has been successfully tested to 2100°F at a 6-inch clearance
from combustible materials. This level of safety delivers the peace
of mind your customers demand. Temperature rating of 1000°F
Max continuous; 1400°F brief forced red; and 2100°F 30 minutes
tested.
The inner liner is made of corrosion-resistant stainless steel,
helping to deliver better protection of the exterior nish. The outer
wall features a series of openings that allow for maximum recovery
of heat from the ue gases. In fact, it is almost as ecient as a
single wall black pipe.
DESIGNED FOR INSTALLATION EASE
The Duravent Double-Wall black stove pipe can be safely installed
as close as 6 inches to combustible materials, providing greater
installation exibility. Furthermore, it may be used with all types of
stoves and is available in diameters of 6, 7 and 8 inches.
To simplify installation, Duravent has designed a telescopic
Double-Wall black pipe, which extends from 3-1/2 feet to 5-1/2
feet. There is no need to determine the number of lengths required
and no need for cutting—it will adjust to your application.
LONGLASTING ASSURANCE
Duravent warrants a limited lifetime warranty for its double wall
black stove pipe.
Specications
DDW
Applications
Double-wall interior stovepipe for
connecting wood stoves and other
solid-fuel appliances to manufactured
chimney.
Materials and Construction
.016” stainless steel inner wall.
.018” galvanized outer, painted black.
Clearances
6” clearance to walls and ceilings.
Diameters
6”, 7”, 8”
Listings
listed to ULC S641.

800.835.4429 | Duravent 3
DOUBLE WALL
STOVE PIPE
Features Benets
Exclusive twist-lock assembly • No screws or other attachments required
• Fast and easy installation with 1/8-inch turn
Stainless steel inner lining • Enhanced corrosion & heat resistance for lifetime
performance
Outer wall with series of openings • Allows for maximum recovery of heat from the ue gases
• Provides low surface temperature
Telescopic design extends from 3-1/2 feet to 5-1/2
feet
• Adjusts to the application
• No need to predetermine lengths
• No need for cutting
• Saves time and material costs
Limited lifetime warranty • Assures product condence and peace of mind

4Duravent | www.duravent.com
Double-Wall Stovepipe
Installation
The clearance between the stove connector and
any combustible material must not be less than
6 inches.
For most straight installations, only a telescopic
length will be required. The telescopic length
adjusts from 42" up to 66".
For installations with high ceilings, we
recommend that the maximum vertical length
(no elbows) of double wall black connector that
can be installed should be 20'.
Creosote
Smoke from a wood re always contains some
unburned gases and a fog of unburned tarlike
liquids. When these materials condense they
form a dark brown or black deposit called
creosote. Creosote formation in a chimney
cannot be eliminated, but it can be minimized
by:
1. Keeping the temperature of the gases in the
chimney above 300ºF.
2. Making small hot res rather than slow
burning, smoldering res.
Coal
Some coals contain large quantities of Sulphur (up to 7%). When
coal is burned, Sulphur and coal ashes are deposited in the chimney
ue. This deposit combines with moisture to form a highly corrosive
acid (Sulphuric Acid). In order to protect your chimney connector,
we recommend that you:
1. Burn only low Sulphur coals (less than 1% Sulphur).
2. Have your chimney cleaned within 48 hours of shutting down
your stove at the end of the heating season. Be certain that all the
soot is removed. Wipe the chimney ue using a strong solution of
baking soda and water. This can be done by wrapping a rag around
a chimney cleaning brush, dipping it in the baking soda-water
solution, then passing it through the chimney three or four times.
ELBOW OFFSET & RISE CHART
Length between elbows
Diameter None 6
” 12 ” 24 ” 36 ”
6 ”
Oset 2 ¼
” 5 ¼ ” 9 ½ ” 18 ” 26 ½ ”
Rise 11 ¾
” 14 ¼ ” 18 ½ ” 27 ” 35 ½ ”
7 ”
Oset 3
” 6 ” 10 ¼ ” 18 ¾ ” 27 ¼ ”
Rise 12
” 15 ” 19 ¼ ” 27 ¾ ” 36 ¼ ”
8 ”
Oset 3 ¼
” 6 ¼ ” 10 ½ ” 19 ” 27 ½ ”
Rise 13 ½
” 16 ½ ” 20 ¾ ” 29 ¼ ” 37 ¾ ”
OFFSET
RISE
LENGTH
BETWEEN
ELBOWS

800.835.4429 | Duravent 5
Double-Wall Stovepipe
This Double-Wall stove pipe is used to
connect a solid, liquid or gas red appliance
to a factory built or masonry chimney.
The clearance between the stove pipe
and combustible material must not be
less than 6 inches.
Do not enclose this stove pipe.
This stove pipe must not pass through
attics, closets, walls, or ceilings.
Never overre your stove. If any part of
the stove or pipe is glowing red, then
you are overring. Immediately close
the stove's dampers until the system
cools. The high temperature caused by
overring can permanently damage
the stove and may overheat nearby
combustible walls and furniture.
Install the stove and stove pipe as
described in the installation instructions
accompanying the stove. Be certain
to maintain the required clearances to
combustible construction.
Do not burn sea driftwood or treated
wood. Salt and chemical components are
highly corrosive to all types of stainless
steel.
INSTALLATION KEY
1Insulated Chimney
2Finishing Support/Ceiling Support
3Telescopic Length
4Appliance
5Storm Collar
6Roof Flashing
7Round Ceiling Support
8Double Wall Lengths
9Insulated Wall Thimble
10 Decorative Collar
11 Elbow
12 Wall Support
13 Insulated Tee
14 Insulated Chimney Flue Extension
1
4
2
3
Straight installation
6
7
4
5
6 in
8
Cathedral ceiling installation
4
3
14 12
9
1
13
10
11
6 in
Through-the-wall installation
6 in

6Duravent | www.duravent.com
Double-Wall Stovepipe
Length
Ø
A
Designed for installation with minimum clearance of 6” to combustible
material. Available in 6”, 7”, and 8” diameters clearance.
*Eective length
SIZE Ø 6" 7” 8”
6” LENGTH
A * 4 ⁄” 4 ⁄” 4 ⁄”
ORDER # 6DDW-L6 7DDW-L6 8DDW-L6
STOCK # 810017218 810017238 810017257
12” LENGTH
A * 10 ⁄” 10 ⁄” 10 ⁄”
ORDER # 6DDW-L12 7DDW-L12 8DDW-L12
STOCK # 810017219 810017239 810017258
24” LENGTH
A * 22 ⁄” 22 ⁄” 22 ⁄”
ORDER # 6DDW-L24 7DDW-L24 8DDW-L24
STOCK # 810017220 810017240 810017259
36” LENGTH
A * 34 ⁄” 34 ⁄” 34 ⁄”
ORDER # 6DDW-L36 7DDW-L36 8DDW-L36
STOCK # 810017221 810017241 810017260
Telescopic Length
Use for a two-piece installation from stove to ceiling support box.
No cutting required.
*Eective length.
SIZE Ø 6” 7” 8”
A* 42 ” - 66 ” 42 ” - 66 ” 42 ” - 66 ”
ORDER # 6DDW-L42A 7DDW-L42A 8DDW-L42A
STOCK # 810017222 810017242 810017261
Ø
A

800.835.4429 | Duravent 7
Double-Wall Stovepipe
Adjustable Length Slide over any regular length. Not to be used with Elbows.
*Adjustment range.
Ø
A
B
Use to increase stove pipe diameter.
Increaser
SIZE Ø 6” 7” 8”
A7” 8” 8”
B6” 7” 6”
ORDER # 6DDW-LW7 7DDW-LW8 6DDW-LW8
STOCK # 810017232 810017251 810017233
SIZE Ø 6” 7” 8”
12”
Adjustable
A12” 12” 12”
B * 3” - 9” 3” - 9” 3” - 9”
ORDER # 6DDW-L3A 7DDW-L3A 8DDW-L3A
STOCK # 810017223 810017243 810017262
18”
Adjustable
A18” 18” 18”
B * 3” - 16” 3” - 16” 3” - 16”
ORDER # 6DDW-L18A 7DDW-L18A 8DDW-L18A
STOCK # 810017224 810017244 810017263
36”
Adjustable
A36” 36” 36”
B * 3” - 34” 3” - 34” 3” - 34”
ORDER # 6DDW-L36A 7DDW-L36A 8DDW-L36A
STOCK # 810017225 810017245 810017264
6DDW-LW8
6"
6 1/4"
6DDW-LW7 / 7DDW-LW8
ØA INT.
ØB INT.
7"

8Duravent | www.duravent.com
Double-Wall Stovepipe
Reducer
Use to decrease the stove pipe diameter. Use of this part must
be approved by the appliance manufacturer or authority
having jurisdiction.
SIZE Ø 6” 7” 8”
A7” 8” 8”
ORDER # 7DDW-LR6 8DDW-LR7 8DDW-LR6
STOCK # 810017252 810017272 810017273
Stove Adaptor
Ø
5 7/8"
Use as required to connect stovepipe to stove outlet.
Damper
Connects pipe to the appliance ue outlet.
Will replace Stove adapter.
Required for chimney draft control.
SIZE 6” 7” 8”
ORDER # 6DDW-LK 7DDW-LK 8DDW-LK
STOCK # 810017234 810017253 810017274
7DDW-LR6 / 8DDW-LR7
Ø
ØA INT.
7"
8DDW-LR6
6 1/4"
6"
8"
SIZE Ø 6” 7” 8”
ORDER # 6DDW-AB 7DDW-AB 8DDW-AB
STOCK # 810017230 810017250 810017269
Jotul Stove Specic Adapter available.
SIZE Ø 6”
ORDER # 6DDW-AJOTUL
STOCK # 810017231
6"

800.835.4429 | Duravent 9
Double-Wall Stovepipe
45°Elbow
Ø
A
B
Use as required to oset ue.
SIZE Ø 6” 7” 8”
A5 ¼” 5 ½” 6 ¼”
B2 ⁄” 2 ⁄” 2 ¾”
ORDER # 6DDW-E45 7DDW-E45 8DDW-E45
STOCK # 810017227 810017247 810017266
90° Elbow
Ø
A
B
Use as required to oset ue.
SIZE Ø 6” 7” 8”
A5 ⁄” 5 ¾” 7 ⁄”
B5 ⁄” 6 ⁄” 7 ¾”
ORDER # 6DDW-E90 7DDW-E90 8DDW-E90
STOCK # 810017228 810017248 810017267
Tee
Use on rear-vented outlets.
Includes clean-out cap.
SIZE Ø 6” 7” 8”
A10 ¼” 12 ¼” 14 ¼”
B3” 2 ⁄” 7 ⁄”
C6 ⁄” 7 ⁄” 8 ⁄”
ORDER # 6DDW-T 7DDW-T 8DDW-T
STOCK # 810017226 810017246 810017265
C
A
B
Ø

10 Duravent | www.duravent.com
Double-Wall Stovepipe
DuraTech®Premium Flue Extension
Use to connect stovepipe to DuraTech Premium (DTP)
Chimney.
SIZE 6” 7” 8”
A3” 3” 3”
B5 ⁄” 6 ⁄” 7 ⁄”
ORDER # 6DTP-CA 7DTP-CA 8DTP-CA
DuraTech®Canada Flue Extension
B
A
Use to connect stovepipe to DuraTech Canada (DTC) Chimney.
SIZE 6” 7” 8” 10”
A3”
B6” 7” 8” 10”
ORDER # 6DTC-CA 7DTC-CA 8DTC-CA 10DTC-CA
Masonry Chimney Adaptor
Required to connect to a masonry chimney.
SIZE Ø 6” 7” 8”
ORDER # 6DDW-MA 7DDW-MA 8DDW-MA
STOCK # 810017229 810017249 810017268
B
A
Ø
11 7/8"
3 3/8"

800.835.4429 | Duravent 11
Double-Wall Stovepipe
Decorative Collar
ØA
ØB
C
5/8"
Conceals the joint between the double wall connector and
the insulated chimney in a Through-the -Wall installation.
*DDW-QDH for DTC chimney; *DDW-QDH for DTP chimney.
SIZE Ø 6” 7” 8”
A 8 ⁄ ”9 ⁄” 10 ⁄”
B6 ⁄” 7 ⁄” 7/8”
C1 ⁄” 7/8” 7/8”
ORDER # 6DDW-QDH 7DDW-QDH 8DDW-QDH
STOCK # 810017235 810017254 810017275
SIZE Ø 6” 7” 8”
A10 ⁄” 11 ⁄” 12 ⁄”
B6 ⁄” 7 ⁄”
8 ⁄ ”
C7/8” 7/8” 7/8”
ORDER # 6DDW-QDX 7DDW-QDX 8DDW-QDX
STOCK # 810017236 810017255 810017276
Trim Collar
ØA
2"
Used to conceal the joint between the double wall stove pipe
and the chimney in a Through-the -Wall installation.
Oval-Round Stove Adaptor
Ø
6"
15"
10 5/8"
For connection of stovepipe to appliances with oval outlet
collars. For advice on sizing, please refer to our installation
instructions.
SIZE Ø 6” 7” 8”
A6-1/2” 7-15/32” 8-17/32”
ORDER # 6DDW-Q 7DDW-Q 8DDW-Q
STOCK # 810017237 810017256 810017277
SIZE Ø 6” 8”
ORDER # 8DDW-LORR6A 8DDW-LORA
STOCK # 810017271 810017270

12 Duravent | www.duravent.com
Double-Wall Stovepipe
Notes:

Double-Wall Stovepipe
800.835.4429 | Duravent 13
DuraVent Limited Lifetime Warranty
DuraVent, Inc. (“DuraVent”) provides this limited lifetime
warranty for all of its products with the exception of
Ventinox® (lifetime), and PolyPro® (ten years). Subject
to the limitations set forth below, DuraVent warrants
that its products will be free from defects in material or
manufacturing, if properly installed, maintained and used.
DuraVent products are fully warranted if installed only by a
professional installer. This Warranty is transferable from the
original homeowner to the buyer of the home. This warranty
does not cover normal wear and tear, smoke damage or
damage caused by chimney res, acts of God, or any product
that was: (1) purchased other than from an authorized
DuraVent dealer, retailer or distributor; (2) modied or
altered; (3) improperly serviced, inspected or cleaned; or
(4) subject to negligence or any use not in accordance with
the installation instructions included with the product
as determined by DuraVent. Installation instructions are
available online at www.duravent.com under Support/
Literature and through our Customer Service Department
800-835-4429 or [e-mail]. This
limited lifetime warranty applies only to parts manufactured
by DuraVent.
DuraVent provides the following warranties for its products:
One Hundred Percent (100%) MSRP 15 years from the date of
purchase, and Fifty Percent (50%) thereafter, except for the
following limitations on: all Termination Caps and DuraBlack®
are warranted at One Hundred Percent (100%) for ve years.
All warranty obligations of DuraVent shall be limited to repair
or replacement of the defective product pursuant to the
terms and conditions applicable to each product line. These
remedies shall constitute DuraVent’s sole obligation and sole
remedy under this warranty. This warranty provides no cash
surrender value. The terms and conditions of this warranty
may not be modied, altered or waived by any action,
inaction or representation, whether oral or in writing, except
upon the express, written authority of an executive ocer of
DuraVent.
Corn, bio-fuels, driftwood or other wood containing salt,
preservative-treated lumber, plastic and household trash or
garbage, or wood pellets containing such materials must not
be burned in the appliance or replace. In case of a chimney
re, the chimney must be inspected and approved by a
certied Chimney Sweep before reuse. After each annual
inspection, maintenance, and cleaning, the certied Chimney
Sweep must ll out and date the appropriate section of the
warranty card provided with the chimney liner.
LIMITATIONS ON INTERNET SALES: Notwithstanding
any other terms or conditions of this Limited Lifetime
Warranty, DuraVent provides no warranty for the following
specic products if such products are not installed by a
qualied professional installer: DuraTech®, DuraTech® DTC,
DuraPlus HTC®, DuraTech® Premium, DDW®, DuraChimney®
II, DuraPlus Canada 2, PelletVent Pro®, DirectVent Pro®,
www.duravent.com | 800-835-4429
FasNSeal®, FasNSeal® W2, FasNSeal® Flex, and PolyPro®, and
DuraVent’s relining products including DuraLiner®, DuraFlex®
(SW, Pro, 316, 304), and Ventinox®. For purposes of this
warranty, a trained professional installer is dened as one
of the following: licensed contractors with prior chimney
installation experience, CSIA Certied Chimney Sweeps, NFI
Certied Specialists, or WETT Certied Professionals.
DuraVent must be notied and given the opportunity to
inspect defective product prior to replacement under the
terms of this limited lifetime warranty. All warranty claims
must be submitted with proof of purchase. Labor and
installation costs are not covered under this warranty. To
obtain warranty service contact: DuraVent Warranty Service,
877 Cotting Ct., Vacaville CA 95688, or call 800-835-4429.
WHERE LAWFUL, DURAVENT DISCLAIMS ALL OTHER
WARRANTIES, INCLUDING BUT NOT LIMITED TO IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE. IN NO EVENT WILL DURAVENT BE
LIABLE FOR INCIDENTAL, CONSEQUENTIAL, PUNITIVE OR
SPECIAL DAMAGES OR DIRECT OR INDIRECT LOSS OF ANY
KIND, INCLUDING BUT NOT LIMITED TO PROPERTY DAMAGE
AND PERSONAL INJURY. DURAVENT’S ENTIRE LIABILITY
IS LIMITED TO THE PURCHASE PRICE OF THIS PRODUCT.
SOME STATES DO NOT ALLOW LIMITATIONS ON IMPLIED
WARRANTIES, OR THE EXCLUSION OR LIMITATION OF
INCIDENTAL OR CONSEQUENTIAL DAMAGES, SO THE ABOVE
LIMITATIONS AND EXCLUSIONS MAY NOT APPLY TO YOU.
THIS LIMITED WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS,
AND YOU MAY ALSO HAVE OTHER RIGHTS THAT VARY FROM
STATE TO STATE.
For the most up-to-date installation instructions, see
www. duravent.com
REV 05.03.18
Manufactured in Vacaville CA and Albany NY
L209_ 810007492_DV Limited LifetimeWarranty_06-2021

14 Duravent | www.duravent.com
Double-Wall Stovepipe
Notes:

800.835.4429 | Duravent 15
Double-Wall Stovepipe
Customer Service and Support:
Airmate (USA)............................................ 800.992.8368
Airmate (CAN) ............................................888.735.5475
Ameriow .....................................................800.252.8467
Amerivent (Retail)....................................800.252.8467
Amerivent (Hearth & Wholesale) .... 800.423.4270
Amerivent (Support)...............................800.748.0392
AMPCO (USA) .............................................800.669.3269
AMPCO (CAN).............................................888.735.5475
Duravent ...................................................... 800.835.4429
Hart & Cooley............................................. 800.433.6341
Hart & Cooley (Support) ........................800.748.0392
Heatfab (USA).............................................800.772.0739
Heatfab (CAN) ............................................800.848.2149
Lima................................................................ 800.423.4270
Milcor ..............................................................800.774.5240
Portals Plus..................................................800.774.5240
RPS.................................................................. 800.624.8642
Security Chimney (USA)....................... 800.361.4909
Security Chimney (CAN) .......................800.667.3387
Selkirk (USA) Residential..................... 800.992.8368
Selkirk (USA) Commercial................... 800.848.2149
Selkirk (USA) Support.............................800.748.0392
Selkirk (CAN) .............................................. 888.735.5475
Manufacturing & Distribution Centers:
CANADA
Nobel, ON Manufacturing
Laval, QC Manufacturing
Prescott, ON Distribution
USA
Grand Rapids, MI Center of Excellence
Dallas, TX Distribution
Englewood, OH Distribution
Huntsville, AL Manufacturing & Distribution
Mira Loma, CA Distribution
Nampa, ID Manufacturing & Distribution
Turner Falls, MA Manufacturing & Distribution
Vacaville, CA Manufacturing
MEXICO
Ojinaga, MX Manufacturing
Mexicali, MX Manufacturing
Corporate Headquarters:
Duravent Group
28 W. Adams, Suite 1810
Detroit, MI 48226
Tel: [phone]
Email: [e-mail]
www.duraventgroup.com

© 2023 Duravent Group. All rights reserved.
DV_DDW_CT-001E_04-23
www.duraventgroup.com