Use in interior or exterior installations to add lateral support to the chimney Assures a 2 to 6 clearance to combustible walls Required every 8Â’ADA Compliant: No Collection: DuraTech Fuel Type: Coal, Gas, Oil, Wood Length: 2, 6 Material: Galvanized Pipe Class: Class A Pipe Inside Diameter: 5 Pipe Shape: Round Style: Functional UL Listed: Yes Vent Construction: Double Wall Weight: 2 Width: 10-3 4