VENTILATION OF TOXIC SUBSTANCES: GENERAL VS LOCAL EXHAUST VENTILATION
Ventilation is a primarily an control engineered to reduce or extract the concentration of gases, dusts, vapours, smoke, and fumes in the air. There are two types of ventilation systems: general and local exhaust: General (dilution) ventilation systems supply clean air that mixes with the air in the workplace, diluting the concentration of the contaminant. General ventilation is not suitable to control exposure to toxic substances because these systems actually spread the con
