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.6 Inch Heat-fab 22-ga Welded Black Stovepipe Trim Collar O.d. Is 11 3/4 Inch For 6 Inch Collar and 14 Inch For 7 Inch and 8 Inch Collar