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ventilating jack

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Definition of ventilating jack

: a sheet-metal hood placed over the inlet of a ventilating pipe to cause the induction of an increased air volume into the pipe

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“Ventilating jack.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ventilating%20jack. Accessed 16 Oct. 2021.

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