Creosote, the black or brown residue of combustion that collects to the inner surfaces of the chimney flue liner, is highly flammable. If allowed to Make up, it may possibly catch fire, leading to cracks in "fireproof" brick, stone or clay flue liners and permit heat to reach nearby wood framing https://marcoybdbb.gynoblog.com/27723102/not-known-details-about-fireplace-store-near-me