The Ultra-Temp Chimney System is a rugged chimney designed for maximum safety and performance! Ultra-Temp includes a variety of components to meet every installation requirement. These components may be combined in a wide variety of ways to solve almost any chimney installation problem. Note: Use when chimney extends 5' or more above roof. Legs adjust 48" to 72". Features: Material: 304-alloy stainless steel inner liner. Limited Lifetime Warranty. 6", 7", and 8" List to UL 103HT. Stainless Steel Outer. 1" Solid Pack insulation. Twist-Lock Coupler w/Locking Band included. 2" Clearance to combustibles. UL Listed to UL 103HT. Specifications: Overall Dimensions: 6" (W).