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Ventilation is the exposure of occupants to the effect of air or wind. The human race forthe most part, even today, relies on natural ventilation for much thermal environmentalcomfort, and minimizes discomfort by common sense application of ventilation principles;Obviously, if complete comfort could be attained by ventilation there would be no need forair conditioning. By expenditure of energy--but usually less energy than required for airconditioning--mechanical ventilation can supplement or replace natural ventilation, and cansometimes come surprisingly close to complete comfort.