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plenum ventilation

American

noun

a system of mechanical ventilation in which fresh air is forced into the spaces to be ventilated from a chamber plenum chamber at a pressure slightly higher than atmospheric pressure, so as to expel foul air.

First recorded in 1835–45

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023