See Figures 1 to 4 for examples of better ventilation system layouts, and Figure 5 for poor dilution ventilation design. The use of general ventilation distributes pollutants, to some degree, throughout the entire worksite and could therefore affect persons who are far from the source of contamination.ĭilution ventilation can be made more effective if the exhaust fan is located close to exposed workers and the makeup air is located behind the worker so that the contaminated air is drawn away from the worker's breathing zone. It usually involves large exhaust fans placed in the walls or roof of a building.ĭilution ventilation controls pollutants generated at a worksite by ventilating the entire workplace. What are the main features of dilution ventilation? Back to topĭilution ventilation supplies and exhausts large amounts of air to and from an area or building. Local exhaust ventilation captures contaminants at, or very near, the source and exhausts them outside. This ventilation system is also known as dilution ventilation. General industrial ventilation reduces the concentration of the air contaminants, or controls the amount of heat that accumulates in hot industrial environments, by mixing (diluting) the contaminated air with fresh, clean, uncontaminated air. There are two types of mechanical ventilation systems used in industrial settings: What are the basic types of ventilation systems? Back to top The Industrial Ventilation series of documents discusses the elements of the exhaust system.
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