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The three orange-colored
rectangular objects are called clay flue liners. They're usually
2 feet long and stack on top of one another to carry flue gases
to the outside.
When the flue tiles become
cracked or broken, the flue gas may easily enter the home. And,
if there are no flue liners in a chimney... that's not a good situation.
Sometimes steel liners
need to replace broken or cracked clay liners.
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