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chimney block

noun
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Definition of chimney block

: a concrete block made to form a continuous round flue when a number of such blocks are placed in position one on top of another

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“Chimney block.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/chimney%20block. Accessed 13 December 2019.

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