DuraBlack 8″ Damper Section The DuraBlack 8″ Single Wall Stove Pipe Damper Section is a component that is used in a typical venting installation. The wall stove pipe damper section is to be installed at, or close to, the stove outlet in-line. 5″ pipe section with the damper is pre-installed. Features: Type: Damper Section. Damper Pre-Installed. Section Type: Single Wall Stovepipe. Used in a Typical Venting Installation. Specifications: Inner Diameter: 8″. 5″ Pipe Section With Damper Pre-Installed.