DuraTech's sleek one-inch wall design provides for easy installations, such as installation through 16" on center rafters. Lightweight insulation, combined with twist-lock fittings, provides for a new ease of installation. DuraTech support boxes feature factory installed twist-lock fittings. DuraTech Elbows offer new 360ᄚ swivel. Thermal Tech blanket insulation keeps the outer wall of the chimney cool, while ensuring high flue gas temperatures for optimum draft performance. Encased between dual walls of stainless steel, Thermal Tech blanket insulation is locked into position. This eliminates hot spots common with loose-fill type insulation. No sifting, setting, or dangerous voids. For more information and specs, please visit www.duravent.com