A chimney liner, or flue, is the inner portion of a chimney that contains and channels the products of combustion. For a chimney liner to work properly, it must be free from perforations, cracks, or damage of any kind. If it isn't intact it can allow the products of combustion, such as carbon monoxi...
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http://www.daviddarling.info/encyclopedia/C/AE_chimney_liner.html
A rigid or flexible pipe fitted inside a chimney to form a flue
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http://www.encyclo.co.uk/local/20700
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