The DuraTech 7 Class A Chimney Pipe Wall Thimble adjusts from a minimum of 4 to a maximum of 10 wall thickness, and fits between standard wall studs. To accommodate thicker walls, the telescoping pieces can be extended up to 16 with a field-fabricated extension installed. Interior trim ring painted black. Must be installed with DuraTech chimney pipe horizontally through the wall and extend 6 into the room beyond the interior wall.ADA Compliant: No Collection: DuraTech Fuel Type: Coal, Gas, Oil, Wood Height: 14 Length: 10, 4 Material: Galvanized Steel Pipe Class: Class A Pipe Inside Diameter: 7 Pipe Shape: Round Style: Functional UL Listed: Yes Vent Construction: Double Wall Weight: 6.7 Width: 14