plenum ventilation: Meaning and Definition of

ple'num ventila"tion

Pronunciation: [key]
  1. a system of mechanical ventilation in which fresh air is forced into the spaces to be ventilated from a chamberat a pressure slightly higher than atmospheric pressure, so as to expel foul air.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.