DuraBlack Telescoping Length Stovepipe with Trim – 44″ – 68″ The DuraBlack 6″ x 44″ – 68″ Telescoping Stove Pipe Length is a component that is used in a typical venting installation. Use for a two-piece installation. Connects directly from stove to ceiling support box or finishing collar. Features: Type: Telescoping Stovepipe. No Cutting Required. Comes Standard with Trim. UL Listed. Specifications: Inner Diameter: 6″. Adjusts from: 44″- 68″.