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, The 10-ft, long, high temperature, poly-faced Flexi-Sleeve is designed only for use with Flexi-Liner, Use it when the flue gas temp is below 280 degrees F at the thimble, when large portions of the chimney are located on the exterior of the house, when the liner is venting fan-assisted appliances, or when the flue cavity is much larger than the liner, Flexi-Liner 10"" Flexi Sleeve for 5, 5- or 6"" pipe, 2-ply 3003-alloy aluminum construction, High-temperature, poly-faced sleeve is designed only for use with Flexi-Liner, Available in 3"", 5"", and 5, 5"", SKU: CPPF6179