The DuraChimney II 12 x 36 Galvanized Class A Chimney Pipe Length is a component that is used in a typical venting installation. DuraChimney II pipe is available in 12“, 18, 36, and 48“ lengths. To calculate the installed length of DuraChimney II pipe, subtract 1 from each length of chimney pipe. The chimney pipe is double walled and is UL 103 listed.ADA Compliant: No Collection: DuraChimney II Depth: 15 Fuel Type: Coal, Gas, Oil, Wood Height: 36 Material: Galvanized Steel Pipe Class: Class A Pipe Inside Diameter: 12 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 25 Width: 15