DuraTech 5" - 6"
DuraTech provides the best in safety and performance with a Thermal Tech blanket insulation wrapped between dual walls. It cools the chimney's outside wall while maintaining high flue gas temperatures for optimal draft performance.
For an extra margin of added safety, the inner wall is 25% thicker than competing chimneys. There's no need for locking bands or mechanical fasteners.
Designed for typical, continuous operation at 1000°F flue gas temperatures and has passed the UL high temperature criteria, which include one hour at 1400°F and three ten-minute chimney fire tests at 2100°F.