DuraVent DuraTech 7" Inner Diameter All-Fuel Stainless Steel Chimney Pipe - 24" Length: A vent pipe with a 7" inner diameter is required for this unit. DuraTech's chimney pipe has two steel walls with a layer of ceramic insulation on the inside to help maintain high temperatures without creating harmful heat on the outside. When venting any form of heating appliance, this aids in safety and efficiency. This pipe has a 7" diameter and a twisting lock mechanism that allows it to readily connect to other plumbing. This is a high-quality product with a lifetime warranty, and the efficient design makes it an easy-to-use auxiliary for any heating device.

24 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 7" inner diameter with a 9" outer diameter Limited lifetime warranty UL Listed