A chimney liner is a protective lining installed inside a chimney. Its primary purpose is to direct smoke and gases safely out of the home while preventing heat transfer to combustible materials. Liners can be made from various materials, including clay, metal, or ceramic, and they help improve the efficiency of the chimney. In addition to safety, chimney liners also reduce the risk of chimney fires and protect the chimney structure from corrosive byproducts of combustion. Regular inspections and maintenance of the liner are essential to ensure it remains in good condition and functions effectively.