ventilation

(ven-til-a’shun) [L. ventil a’tio). The proce or act of supplying a house or room continuously with fresh air. downward v., that in which the outlets have places lower than those of the inlets. exhausting v., ventilation by means of the exhausting fan or by some other proce which withdraws the foul air. natural v., ventilation effected without any special appliance to render it certain. plenum v., the supply of fresh air to a building by fan-blowers. upward v., that which introduces air below the place of its withdrawal. vacuum v., that which is effected by the forced extraction of air.