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.
[ 1835-45 ]
PLENUM VENTILATION
Meaning of PLENUM VENTILATION in English
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012