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DuraVent DuraLiner 8" x 14" Round-To-Oval Stainless Steel Flex Pipe

DuraVent DuraLiner 8" x 14" Round-To-Oval Stainless Steel Flex Pipe

Regular price $546.08
Regular price $606.76 Sale price $546.08
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DuraLiner ensures safe and efficient venting of heating appliances while protecting the masonry chimney from the damaging effects of flue gas. It is the only factory-insulated product with zero/zero clearance for high-heat wood-burning appliances. No need to uncoil flex, insulate a majority of the pipe, or protect the insulation when installing. A smooth inner means less creosote buildup.

Installers reduce labor time by 50% or more with DuraLiner. No time was wasted wrapping insulation around the liner for UL 1777 approval.

No spacers are needed to maintain clearance in tight offsets or dampers. Approved for use in both the USA and Canada.

What's Included

  • 14" Flex Pipe (Round-to-Oval)


  • Available in 6" and 8" diameter sizes.
  • Use to connect a round stove outlet to oval DuraLiner.
  • Use with DuraLiner Insulation Kit (ProMesh and ProFoil), where flex extends into clay liner, for zero-clearance applications.
  • Built from 304 stainless steel.


Brand DuraVent
Model 8DLR-14ROF
Series 8" DuraLiner
Product Type Flex Pipe
A 8 5⁄8”
B 10 3⁄4”

Technical Dimensions


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.
Click to See Warranty Coverage and Limitations

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 fires, acts of God, or any product that was: (1) purchased other than from an authorized DuraVent dealer, retailer or distributor; (2) modified 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.


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 five 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 modified, altered or waived by any action, inaction or representation, whether oral or in writing, except upon the express, written authority of an executive officer 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 fireplace. In case of a chimney fire, the chimney must be inspected and approved by a certified Chimney Sweep before reuse. After each annual inspection, maintenance, and cleaning, the certified Chimney Sweep must fill 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 specific products if such products are not installed by a qualified professional installer: DuraTech®, DuraTech® DTC, DuraTech® Premium, DuraPlus HTC®, DDW®, DuraChimney® II, PelletVent Pro®, DirectVent Pro®, 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 defined as one of the following: licensed contractors with prior chimney installation experience, CSIA Certified Chimney Sweeps, NFI Certified Specialists, or WETT Certified Professionals.


DuraVent must be notified 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.




Download DuraVent Limited Lifetime Warranty here.

Documents & Files

Frequently Asked Questions

What are DuraLiner's Specifications?


DuraLiner is a high-temperature, insulated double-wall masonry relining system for use with appliances fueled by gas, pellet, oil, wood, or coal. It safely protects masonry chimneys from the damaging effects of flue product condensation.


Materials and Construction

.016″ 304 stainless steel inner liner. Rigid relining pipe: double-walled with 304 stainless steel inner and galvalume outer. Factory insulated between inner and outer walls. DuraLiner Rigid Pipe in round or oval, is constructed with built-in fittings and pre-drilled holes (stainless steel rivets included). Round 5″ DuraLiner rigid pipe is constructed with built-in twist-lock and pre-drilled holes.



Rigid double wall: 0″ clearance between the liner and masonry and 0″ clearance between the masonry and combustibles. DuraLiner Flex: 1″ clearance to masonry. Zero clearance with insulation.



5“, 6″ and 8”



UL Listed to UL 1777 (MH14420), ULC Listed to ULC S635 .

What is DuraLiner's Typical Installation?

Refer to our Typical Installation drawings to select the appropriate component parts for your installation

  • The inner pipe diameter should match the outlet size of the appliance.
  • Check the appliance manufacturer’s installation instructions for any venting restrictions.
  • Be fire safe! Follow local building codes and have your venting system inspected.

More Typical Installations:

Installation Key

  1. Extend-A-Cap Kit
  2. Round Tee with Round Branch
  3. DuraTech or DuraPlus Chimney
  4. Tee with Removeable Snout
  5. DuraLiner – flexible length
  6. Masonry Thimble w/ Slip Connector
  7. Slip Connector and Hanger
  8. 30° or 45° SS Elbow
  9. Transition Anchor Plate
  10. ProMesh & ProFoil
  11. Insulation Clamp
  12. DuraLiner Appliance Connector
  13. DVL or DuraBlack Stovepipe

Planning Your Installation:

  1. Refer to the Typical Installations for the needed parts for installation.
  2. The size of the liner should match the outlet size on the appliance.
  3. Determine use of round or oval pipe based onthe interior shape of the chimney
  4. Determine the length of liner needed. Subtract 1 1/2″ overlap per joint on pipe. When using Extend-A-Cap kit, liner must extend 6″ above top of the masonry surface.
  5. Make sure the top of the masonry chimney has a leveled surface to insure a proper fit for the Extend-A-Cap or Transition Anchor Plate and to provide a secure, leak-proof installation.
  6. If a free-standing appliance is used, select the vent or stovepipe pieces to connect from the appliance to the liner. Refer to installation instructions.
  7. For Installations using a Transition Anchor Plate, refer to the DuraTech, DuraPlus, or DuraPlus HTC catalog section or installation instructions for proper parts and installation.
  8. Important! Check to be sure the installation complies with all local and national code requirements, including clearance to combustibles. Contact the local building inspector for permit requirements.


Design Recommendations

  • The following design recommendations are a general guideline to assist in the design and selection of liner components for your installation. Always follow DuraVent installation instructions enclosed with the cap or support box before installing your chimney system.
  • Before relining a chimney, it should be cleaned and inspected, by a certified chimney sweep, to verify the integrity of the mortar and masonry.
  • DuraLiner is approved for 0″ clearance between the liner and masonry and 0″ clearance between the masonry and combustibles.
  • DuraLiner is used for wood-burning appliances when zeroclearance or oval pipe is needed.
  • Refer to the appliance manufacturer for installation requirements affecting venting. Keep the vent path as straight as possible for best performance.


Restore Deteriorating Chimneys with DuraLiner

When a masonry chimney is damaged or has fallen down, it can be replaced with a safe, listed liner system or factory-built chimney. DuraLiner, when used with a Transition Anchor Plate and in combination with DuraTech, DuraPlus, or DuraPlus HTC Chimneys, replaces the damaged masonry chimney with a safe, efficient, and economical listed chimney system (DuraPlus HTC is listed for use in Canada). See Typical Installations for details.

DuraVent DuraLiner Common Questions

1. Is the insulation sleeve required?
Yes, if flex sections of DuraLiner. is used above the first flue tile you need a 1 inch clearance or insulation blanket in that upper narrow area above damper.

2. What are the outside dimensions of the pipe?
8” round is 8 5/8”, 6” is 6 5/8”, 6” oval is 4 3/4” x 7 3/4”, 8” oval is 4 3/4” x 10 3/4”.

3. How tall can I Extend-A-Cap Termination kit above masonry?
Extend-a-cap kit termination may extend from 5” to 5’ above the top of the masonry chimney. (Note: The standard termination is now obsolete).

4. Is DuraLiner® a zero clearance liner?
Yes. Double-wall DuraLiner. has a 0” clearance to combustibles inside masonry and zero clearance from exterior of masonry to building framing.

5. Is it okay to burn coal or oil?
Yes. It is an all-fuel liner ap-proved for wood gas and coal.

6. Is the Transition Anchor Plate approved for both DuraTech® and DuraPlus® insulated chimney extension?
Yes either chimney may be used.

7. What connects the DuraLiner® to the chimney above Transition Plate?
You must use the Slip Connector Hanger assembly to join inners.

8. Is it UL 1777 tested?

9. Can I use the insulation sleeve for other brands of pipe?
No, it is only listed for use with DuraVent®.

10. Is the 8” oval equal to the 8” round?
Yes, they are essentially the same.

11. How do I connect DuraLiner® Pipe?
Use a pop-rivet gun and the rivets provided with each length of pipe.

12. How do I install a Wall-Pass-Through?
Follow the installations instructions. For use through combustible wall.

13. Why is the oval tee single wall?
To keep width to a minimum.

14. How can I order a masonry thimble with a slip connector?
It is available in our catalog. (stock #s: 5DLR-MTSC1: 810014030, 6DLR-MTSC1: 810014031, 8DLR-MTSC1: 810014032.)

15. What type of stainless is used?
304 type stainless steel.

16. What is the clearance to combustibles?
There is no clearance to combustibles when used in masonry.

17. What is more flexible, oval or round?

18. Can I use my own masonry termination caps?
No. You must use a DuraVent. cap for termination.

What are the DuraVent product lines?

DuraVent offers the following product lines:

DuraTech 5″-8″: All-fuel, double-wall chimney system. UL 103 HT and ULC S604.

DuraTech 10″-24″: All-fuel, double-wall chimney system. UL 103.

DuraTech Canada is a double-wall, all-fuel chimney system for use with wood stoves, wood fireplaces, and other appliances using wood, oil, gas, or coal.

DuraPlus: Triple-wall all-fuel chimney with two layers of insulation.

DuraPlus HTC: Double-wall all-fuel chimney built to Canadian standards.

DuraChimney II: Double-wall air-cooled chimney for pre-fabricated masonry chimneys.

Combustion Air Systems: DuraVent’s exclusive, patent-pending system is designed to bring in outside combustion air directly to your wood or pellet stoves.

DuraBlack: Single-wall stovepipe.

DVL: Double-wall stovepipe.

DuraLiner: Double-wall factory insulated masonry relining system.

DuraFlex: Flexible stainless steel liners.

DuraFlex Aluminum: Flexible aluminum relining for masonry chimney. UL 1777 and ULC S635.

Ventinox: Flexible stainless steel liner.

CVS: Provides Ortal Branded Fireplace Systems and as a Direct Vent for Pellet Stoves.

PelletVent: Multi-fuel vent.

PelletVent Pro: Vents appliances using oil, wood pellets, corn, and other biofuels.

DirectVent Pro: Unitized, co-axial venting system for direct vent gas or propane stoves, heaters, and fireplaces.

Type B Gas Vent: Vents natural gas, liquid propane category I, and draft-hood equipped appliances

FasNSeal: Single, double-wall, flex, and concentric venting for category II, III, and IV appliances.

FasNSeal 80/90: Combined Category I and IV venting for Gas-Burning Appliances.

PolyPro: Single-wall, flex, and concentric venting made of polypropylene for category II and IV condensing appliances that operate up to 248 degrees.

PolyPro Flex: PolyPro double-wall flex lining system. Environmentally safe venting system for high-efficiency appliances, including water heaters, condensing boilers, and warm air furnaces. ULC S636.

DuraSeal: Single-Wall and Double-Wall Special Gas Vent Boiler Adapters.

DuraStack: A modular double-wall, positive pressure chimney for use with boiler breeching and stack, engine exhaust, and grease duct (DIS only)

DuraStack Pro: Models DIS and DAS. Modular Double-Wall Positive Pressure Chimney for Boiler Breeching, Stack, and Engine Exhaust.

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