DuraVent DuraFlex 8" Diameter Smooth Wall Stainless Steel Flex Liner - 35 Feet: A venting pipe with an inner diameter of 8" is required for this unit.

Size: 8 Inches Color: Stainless Steel Product Dimensions: 8" Dia x 35 H UL 1777 listed 8" diameter and 35 flex length Lack of ridges facilitates cleaning and maintenance Smooth inner-wall flexible stainless steel chimney liner Smooth wall construction eliminates ridges that restrict flue gas flow Ideal for relining masonry chimney for wood and gas burning appliances