UL 103HT

• Adjusts from a minimum of 4-1/4 in to a maximum of 7-1/4 in wall thickness and fits between standard wall studs To accommodate thicker walls, the telescoping pieces can be extended up to 16 in when a field fabricated extension is installed Interior trim ring painted black Must be installed with DuraPlus® chimney pipe horizontally through the wall and extend a minimum of 2 in into the room beyond the interior wall

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