The DuraTech 6 x 12 Black Class A Double Wall Chimney Pipe Length DuraTech 5 - 8 diameters chimney pipe is designed for appliances that are tested and listed for is used with a 2100° F HT chimney system, such as wood stoves, fireplaces, furnaces, boilers, ranges, water heaters, or other appliances fueled by wood, oil, coal, or gas.For class a chimney pipe UL ListedADA Compliant: No Collection: DuraTech Finish: Black Fuel Type: Coal, Gas, Oil, Wood Inner Diameter: 6 Length: 12 Material: Galvanized Steel Outer Diameter: 8 Pipe Class: Class A Pipe Shape: Round Style: Functional Weight: 5.6 Width: 8