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Answer: D - Flue liners are safety structures in chimneys. All of the above are reasons to use a liner to protect the chimney. If the flue is not capped properly, rain will get into the flue. Condensation from water vapor that is produced by burning fuel can damage the chimney flue. Even using too much fuel can be harmful to the flue. A flue liner can protect the chimney against all of these conditions.