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Every remodeler will eventually be asked, "Can we use this chimney?" Obviously, if the exterior masonry is cracked, bricks are loose, and mortar is falling from the joints, you have to assess the integrity of the chimney structure. But usually evaluating an old chimney comes down to evaluating the flue, and matching a new liner with the combustion appliances you will hook up to it. The information in this article will help you make the right choices. Avoid Tile Liners If an old chimney has a liner, it will most likely be clay tile. Most codes allow tile liners for use with virtually all appliances. But code assumes proper installation, and in my experience, that's a bad assumption. In the thousands