DuraVent DuraPlus Features
- Finished Wall Pass-Through: Carries the chimney through an exterior wall while holding the required clearance, and finishes the opening on both sides so there is no raw framing showing.
- Triple-Wall Insulated Construction: Two separate insulating layers, a ceramic blanket plus a ventilated air space, keep the outer wall cool while holding flue gases hot inside. A hotter flue means stronger draft, less creosote and a stove burning closer to its rated efficiency.
- Rated to 2100°F for Chimney Fires: UL Listed to UL 103 HT under file MH7399. Built for continuous operation at 1000°F, then tested a full hour at 1400°F and through three separate ten-minute chimney fire tests at 2100°F.
- Only 2" Clearance to Combustibles: Passes through framing, ceiling and roof with just two inches of air space, so it fits standard 16" on-center construction without reframing the opening.
- Twist-Lock Connection: Sections join with a precision twist-lock, no locking bands or fasteners. The ceramic blanket is held in position rather than loose-filled, eliminating the hot spots and settling common to poured insulation.
DuraPlus Thimble Specifications
| Part Number | 6DP-WT |
| Diameter | 6" |
| Material | Galvalume |
| Function | Wall pass-through |
| Construction | Triple-wall, all-fuel |
| Inner Liner | .016" 430 stainless steel |
| Intermediate Liner | .018" aluminized steel |
| Outer Wall | .018" galvanized steel |
| Insulation | Ceramic blanket plus ventilated air space |
| Connection Type | Twist-lock |
| Clearance to Combustibles | 2" |
| Listing | UL 103 HT (MH7399), ULC S629 |
| Continuous Flue Temperature | 1000°F |
| Chimney Fire Rating | 2100°F |
| Approved Fuels | Wood, oil, coal, gas |
DuraVent Chimney Wall Thimble Installation Manual
Download the full manufacturer installation instructions before you begin. Installation must follow these instructions and your appliance manual to stay code compliant and keep the warranty valid.
DuraPlus Wall Pass-Through FAQ
Will this work with my wood stove?
If your stove has a 6" flue outlet, yes. Wood stove manufacturers call for a chimney listed to UL 103 HT (2100°F), which is exactly what DuraPlus carries. Drolet, for example, specifies a 6" HT type chimney in its manuals without naming a brand.
Can I connect this to another brand of chimney?
No. Class A chimney systems use proprietary locking joints and are listed as complete systems, so DuraPlus will not join to DuraTech, Selkirk or Ventis. Everything from the ceiling support box to the cap must be DuraPlus.
What is the difference between this and black stovepipe?
They are not interchangeable. Black stovepipe is connector pipe for the exposed run from stove to ceiling only and cannot pass through a ceiling, wall or roof. DuraPlus is Class A insulated chimney, which carries the flue through the building and outside.
How close can this be to framing and insulation?
Two inches of clearance to any combustible, the entire length of the run. Where it passes through an attic you also need an attic insulation shield. Never pack insulation against the chimney even though the outer wall runs cool.
How much chimney do I need?
Most wood stove manuals require a minimum total height of 12 feet measured from the stove. Four 36" sections gets you there, plus a ceiling support box, flashing, storm collar and cap to finish the run.
Does it need to be swept like masonry?
Yes. Any solid fuel chimney should be inspected and swept at least once a year. The smooth stainless liner sweeps faster and builds less creosote than masonry, but it still needs the annual service.
Is it covered by a warranty?
DuraVent backs DuraPlus with a limited lifetime warranty when installed to their instructions. Keep your receipt and follow the clearance requirements, since improper installation voids coverage.