Metal-Fab's Temp Guard® chimney is intended for use on residential and building heating appliances burning wood, oil, coal, or gas. Temp Guard® is tested and listed to UL standard 103HT. The maximum continuous operating temperature for this product is 1000º F. Metal-Fab's Temp Guard® design incorporates features that make installation quicker, easier, and safer. Ceramic fiber insulation that provides even distribution of flue gas temperature. Light weight pipe that is 1/2 the weight of packed pipe. Positive twist lock for easy assembly.