Why Do I Need a Stainless Steel Chimney Liner? By: Tim McGirl A chimney liner is a duct present on the inside of the chimney to prevent the combustion products from escaping the chimney. Since a lot of heat is generated inside the chimney, it is exposed to heat and corrosion which can be prevented by regular chimney cleaning and installation of chimney liner. Before 1940, chimney liners were not the standard but now all new chimneys required to have a liner. Chimney liners are often a neglected feature but are very essential to every chimney in a home….