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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.

Etymology

Origin of plenum ventilation

First recorded in 1835–45

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.