DuraVent DuraTech 8-Inch Inner Diameter All-Fuel Stainless Steel Chimney Pipe - 48-Inch Length Venting Requirements: This unit requires venting pipe with an inner diameter of 8 Inches. This double wall chimney pipe is stainless steel. The stainless steel in the outer wall is .016 inch thick and the inner wall stainless steel is .020 inch thick. The secure twist lock feature means it connects easily with other components. with same twist lock feature. There is only some twisting required. There is no need for adaptors or adhesives. The inner diameter measures 8 inches and the outer diameter measures 10 inches.

48 Inch length Double-wall chimney pipe for wood oil coal and gas appliances .016" stainless steel outer wall and .020" stainless steel inner wall Insulated by a layer of ceramic refractory blanket Secure twist-lock connections 2" clearance to combustibles 8" inner diameter with a 10" outer diameter Limited lifetime warranty UL Listed