This DuraLiner 6 x 36 Chimney Relining Round-to-Round Flex Pipe efficiently helps venting of heating appliances while protecting masonry chimneys from the damaging effects of flue gas. Use through damper and smoke shelf area. Use with DuraLiner Two-Ply Insulation Sleeve, where flex extends into clay liner, for zero-clearance applications. Built from 1-ply construction, 0.01 304 stainless steel.ADA Compliant: No Collection: DuraLiner Fuel Type: Coal, Gas, Oil, Pellet, Wood Length: 36 Material: Aluminized Steel Pipe Class: Rigid Liner Pipe Inside Diameter: 6 Pipe Shape: Round Style: Contemporary Modern UL Listed: Yes Vent Construction: Double Wall Weight: 13