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Ventilation
Ventilator is an opening or a device that allows fresh air to enter into an enclosed space. A great reduction in the airborne microorganisms can be brought about by laminar airflow system developed by Whitfield. It was found that a horizontal flow of air at about 40 feet/minute in a room in which spores of Bacillus subtilis had been liberated, led to a diminution in their numbers by 100-1000 times greater than that to be expected in a room where turbulent ventilation was employed. The ultimate criterion of its effectiveness must be the diminution of cross infection.