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, Flexi-Liner is intended for use as a liner in masonry chimneys used to vent gas-fired appliances with draft hoods and appliances intended for use with Type B gas vents, Please note the actual outside diameter of Flexi-Liner is approximately 3/8"" larger than its inside diameter, SKU: CPPF2248