Chimney has been filling the supply and accessory needs of over 8,000 chimney sweeps hearth retailers masons and contractors for over 25 years. Chimney has the privilege of serving over 80% of the chimney professionals in America.Founded by Robert Daniels Sooty Bob in 1978 Chimney has grown from a one-man operation to a national network of six warehouses and a manufacturing plant. From its headquarters in Fairfield Iowa Chimney plays a major role in providing for the Chimney industry. Ventinox VFT chimney liner carries a lifetime warranty for wood oil pellet and gas applications. It is UL listed to the 1777 standard for zero clearance to combustibles when properly insulated. VFT should be insulate with two wraps of 1/4 Foil-Face Flex Wrap or a minimum of 1 inch of TherMix for wood and coal applications to achieve the UL listing. Though Ventinox VFT liner is lightweight at only 0.006 thick its continuous weld construction forms a spiral backbone that gives excellent strength and workability. Ventinox VFT can be bent quite radically without kinking and may be ovalized as well. Outside diameter is 1/2 larger than inside diameter. VFT 10-ft. Pre-Cut Liner with welded seam construction for 12 pipe. 0.006 316-Ti alloy. For best performance should be insulated with 2 wraps of 1/4 Foil-Face FlexWrap or a minimum of 1 TherMix for wood or coal applications to achieve the UL listing. UL Listed to the 1777 Standard for zero clearance to combustibles when properly insulated. Manufacturers lifetime warranty for wood oil pellet and gas applications and 10 year warranty for coal.