The DuraTech 14 x 12 Galvanized Class A Double Wall Chimney Pipe Length DuraTech chimney pipe 10 - 24 diameters are is designed for appliances that are tested and listed for is used with a 1700° F rated chimney system, such as zero-clearance or masonry fireplaces, furnaces, boilers, water heaters, ranges, or other appliances fueled by oil, coal, gas, or wood.For class a chimney pipe UL ListedADA Compliant: No Collection: DuraTech Fuel Type: Coal, Gas, Oil, Wood Inner Diameter: 14 Length: 12 Material: Galvanized Steel Outer Diameter: 16 Pipe Class: Class A Pipe Shape: Round Style: Functional Weight: 14.9 Width: 16