The DuraChimney II 12 Class A Chimney Pipe Firestop Assembly is a component that is used in a typical venting installation. Use in ceiling floor penetrations above fireplace. Firestop is not required when passing through the roof. Fits on underside of ceiling.ADA Compliant: No Collection: DuraChimney II Depth: 21-5 8 Fuel Type: Coal, Gas, Oil, Wood Material: Galvanized Steel Pipe Class: Class A Pipe Inside Diameter: 12 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Weight: 4 Width: 21-5 8