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DuraVent DuraPlus Chimney System

Jun 9th 2020

DuraPlus is a triple-wall, 2100° HT (high temp) all-fuel chimney system designed for appliances that require a UL 103 HT chimney system, such as wood stoves, fireplaces, furnaces, boilers, stoves, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas, and zero clearance fireplaces that are factory-built. This triple-wall pipe 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. Locks tightly with a precision twist-lock connection. Simpson DuraPlus carries a limited-lifetime warranty.

Please Note: All Stove & Chimney Pipe is chosen and classified by the inside diameter. If your flue has a 6" Inside Diameter you will choose from the 6" Stove and Chimney Pipe categories only


Typical Installations

Using the Typical Venting Installation drawings, select the appropriate component parts for your installation.

DVL/DuraBlack Chimney Adapter or DuraBlack Slip Connector must be used when connecting DVL or DuraBlack stovepipe to a Ceiling Support, Wall Thimble, or Finishing Collar.

A Snap-Lock Adapter must be used when attaching snap-lock stovepipe to DuraPlus.

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.

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.

Firestop Radiation Shield must be used when a chimney passes through a floor or ceiling without a Ceiling Support Box.

Cathedral Ceiling


Oil Furnace


Attic Offset


Through The Wall


Fireplace (New or retrofit)


Manufactured Home *DVL stovepipe required


Installation Key

1 DVL or DuraBlack 11 Tee with Tee Cap
2 Ceiling Support Box 12 Tee Support
3 Wall Thimble 13 Chase Top Flashing
4 Chimney Pipe 14 Base Tee/Double Tee
5 Attic Insulation Shield 15 Anchor Plate or Anchor Plate with Damper
6 Flashing 16 Roof Support
7 Storm Collar 17 Finishing Collar
8 Chimney Cap 18 DVL Adapter, DuraBlack Slip Connector, or Snap-Lock Adapter
9 Elbow
10 Elbow Strap 19 Stove Adapter

Be fire-safe!

Maintain at least a minimum 2" clearance (air space) to combustibles. Use proper support and bracing. Follow local building codes and have your chimney inspected by a certified professional.

Measure the inside diameter of the appliance flue outlet. Select the chimney and either DVL or DuraBlack connector stovepipe with the same size inside diameter as the appliance flue outlet. For fireplace installations, refer to the sizing chart in the back of the DuraTech section of this catalog.

Determine if the installation is a through-the-roof installation or a through-the-wall installation. A through-the-wall installation will require additional components (Wall Thimble, Tee w/ Cap, Tee Support, and Wall Straps).

Install the chimney in the interior of the structure whenever possible. A cold exterior chimney will produce less draft and will generate more creosote.

If possible, avoid offsets that serve to restrict the natural draft.

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