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plenum ventilation

noun
1.
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.
Origin
1835-1845
1835-45
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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