The DuraTech 6 Class A Chimney Pipe Flat Ceiling Support Box is used to support chimney pipe and provides a positive connection between support box and chimney with a built-in twist-lock. It is designed for installation in flat ceilings only. Supports up to 60' of DuraTech Chimney. Use adapter to attach DVL or DuraBlack to the support box. 3 A 2 wide trim collar is included. It is not painted, but can be painted with high temperature paint.Fuel Type: Coal, Gas, Oil, Wood Height: 7 Length: 12 Material: Galvanized Steel Pipe Class: Class A Pipe Inside Diameter: 6 Pipe Shape: Round Style: Functional UL Listed: Yes Vent Construction: Double Wall Weight: 9.3 Width: 12