DuraVent DuraTech 8" Inner Diameter All-Fuel Stainless Steel Chimney Pipe - 12" Length: A venting pipe with an inner diameter of 8" is required for this unit. Stainless steel makes up this double-walled chimney pipe. The exterior wall is .016 inch thick, while the interior wall is .020 inch thick stainless steel. It connects effortlessly with other components due to the secure twist lock function. The twist lock functionality is the same as before. All that is required is a little twisting. Adaptors and adhesives aren't required. The inner diameter is 8", with a 10" exterior diameter.

12 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