Removing Flue Liner . Removing a fireplace damper is a common part of a chimney renovation that homeowners come across. This includes removing all of the creosote and soot that has built up over time. Removal of Cast Iron Chimney Flue & Fitted Fireplace From inside a BISF from nonstandardhouse.com Both of these products contain unique chemical catalysts that break down the creosote over time. Minor chimney liner problems like replacing. One is a flue liner and the other a flue pipe.