DuraPlus is designed to stay cool on the outside, to provide a hot draft on the inside, to boost stove efficiency, and to provide for a fire-safe design that protects both the chimney and the building. This triple-wall chimney 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.

Designed for normal, continuous operation at 1000°F flue gas temperatures, DuraPlus® subjected to rigorous and stringent HT requirements of the UL standard, including one hour at 1400°F, plus three ten minute chimney fire tests at 2100°F.

What's Included

• Wall Thimble

Features

• Adjusts from a minimum of 4 3⁄4” to a maximum of 7 3⁄4” wall thickness, and fits between standard wall studs.
• To accommodate thicker walls, the telescoping pieces can be extended up to 16” with a field-fabricated extension installed.
• Interior trim ring painted black.
• Must be installed with DuraPlus chimney pipe horizontally through the wall and extend a minimum of 2” into the room beyond the interior wall.
• For adapters, see DVL and DuraBlack section.

Specifications