The DuraVent 6DFSW-20 is a flexible chimney liner from the DuraFlex Collection. This chimney liner comes with flexible components that add flexibility for easy installation. It also comes in a stainless steel finish for added resistance against corrosion. Appliances fueled with wood, gas, and pellet are compatible with this chimney liner. This flexible liner features a 6-inch inner diameter and has a length of 20-foot. Like many other DuraVent products, this flexible chimney liner is backed with a limited lifetime warranty. It is also a UL listed for meeting the standard for safety. In cooperation with DuraVent, we at PlumbersStock carry high-quality products like this liner for a very affordable price.