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curtain board

noun
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Definition of curtain board

: a partition of noncombustible material fitting tightly against a ceiling and intended to prevent or retard the spread of fire and heat

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“Curtain board.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/curtain%20board. Accessed 6 May. 2021.

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