This 4 Inch Pellet Chimney Cathedral Ceiling Support Box from the PelletVent Pro series is a Type B gas component and consists of the duralock system for a tight seal. Use to support pipe. May be used on flat ceilings. Painted black. Trim and clamp included.Finish: Stainless Steel Fuel Type: BioFuel, Oil, Pellet Height: 14 Length: 14-1 4 Material: Galvalume, Stainless Steel Pipe Class: Type L Pipe Inside Diameter: 4 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 7 Width: 14-1 4