cULus Listed|UL 103HT|ULC S604 MH7399

• Use on inside of cap

With a thermal tech blanket insulation encased between dual walls, DuraTech® offers the optimum in safety and performance. It keeps the outer wall of the chimney cool, while ensuring high flue gas temperatures for optimum draft performance. The inner wall is 25% thicker than competitive chimneys for an extra margin of safety. No locking bands or mechanical fasteners required. DuraTech's sleek 1 in wall design provides for easy installations through 16 in on center framing. For tight installations, a reduced clearance square ceiling support box is available (6 in Dia DuraTech® only). Designed for normal, continuous operation at 1000 deg F flue gas temperatures, DuraTech® is subjected to rigorous and stringent high temperature requirements of the UL standard, including 1 hr at 1400 deg F, plus three 10 min chimney fire test at 2100 deg F.