If you have a wood burning stove venting into a lined or unlined masonry chimney, you need a new U.L. Listed liner immediately. Wood burning stoves have chimney fires far too often and the homeowner usually isn’t even aware of it. In this case, my father is my best example. He loved to burn wood and had two woodburning stoves going continuously durning winter. He had at least two chimney fires a year. In the attic, there was black soot oozing out of the chimney. He finally let me reline the chimney once he saw all of the ignited soot at the bottom of the chimney after I cleaned it.