A chimney liner is the conduit, normally located within the chimney of a home heated by wood, gas, or oil, through which smoke, heat, and fuel by-products are expelled. Up until the mid-1900s, a surprising number of homes still featured chimneys without a liner of any kind. It was no coincidence that chimney fires and house fires were far more prevalent in those times than they are in modern times. Our Stainless Steel Liners come with a Lifetime Guarantee!