DuraVent DuraLiner -Oval-To-Oval Flex Pipe
Use through damper and smoke shelf area. Use with DuraLiner Insulation Kit (ProMesh and ProFoil), where flex extends into clay liner, for zero-clearance applications. Built from 1-ply construction, .005” 304 stainless steel.
Overview DuraLiner
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 wasted wrapping insulation around liner for UL 1777 approval.
No spacers needed to maintain clearance in tight offsets or dampers. Approved for use in both the USA and in Canada.
Details
SKU: 6DLR-36OF | 6DLR-60OF | 8DLR-36OF | 8DLR-60OF
Applications
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.
Clearances
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.
Diameters
5 “, 6″ and 8”
Listings
UL Listed to UL 1777 (MH14420), ULC Listed to ULC S635 .
Instructions
- DuraLiner® Installation Instructions
- DuraLiner®: Masonry Thimble L402 Installation Instruction Addendum
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:
- Refer to the Typical Installations for the needed parts for installation.
- The size of the liner should match the outlet size on the appliance.
- Determine use of round or oval pipe based onthe interior shape of the chimney.
- 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.
- 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.
- 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.
- 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.
- 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.
Product Resources
Catalogs
Bulletins
- DuraLiner® Insulation kit 2012 Bulletin
- DuraLiner® Oval Tee Branch 2012 Bulletin
- DuraLiner® Termination Caps Bulletin 2020
- DuraVent Redesigns DuraLiner® Masonry Thimble with Slip Bulletin Connector 05-24-18
- Introducing DuraLiner® 5” Round Tee w/ 6” Branch Bulletin 2014
Brochures
Sales Sheets
Shipping / Freight / Return Info
Same-Day / 24 hour shipping
Same-Day/24 hour shipping - If we have the product in stock, we can ship
same day if ordered before 12pm Monday - Friday (CST).
Freight Claims Policy
Please follow these very important steps when it comes to Freight Items that are damaged or missing
- Open and inspect the order while the delivery driver is present. If delivery driver does not provide sufficient time to do so, please notate the delivery receipt.
- By signing the delivery receipt without noting any damage or missing items, you confirm that your order arrived complete and in excellent condition.
- Record any damage or missing pieces directly on the delivery receipt.
- Do not discard damaged item(s) or any original packaging. For severe damage, write “Refused due to damage” on the delivery receipt and contact us immediately.
- Report any damage within two business days, including delivery details and photos showing the issue
- Damaged item(s) must be returned within 30 days. Failure to return them will result in a charge to the original payment method.
Return Merchandise Authorization Policy
Please follow these very important steps when Returning Items. Contact our team.
- Submit your return request within 30 days of delivery.
- You will receive an email within 1-2 business days confirming whether your return request has been approved or denied.
- Please also note that a 20% restocking fee may apply to approved returns
- If approved, you will receive an itemized Return Authorization, return shipping labels (if requested), and detailed instructions within 1–2 business days
- From the date this email is received, you will have 14 days to return the product.
- Once our distributor receives and inspects the returned item(s), your refund will be issued within 1–2 weeks
- Items returned outside of this process or time frame are not eligible for a refund.
Related products
Shop by Best Sellers
Get In Touch
Call or Text us for our Best Price
It's important to us to go above and beyond for our clients and make sure you make the right decision for your home.