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Ineffective for handling surges of gases or vapours or irregular emissions. Requires smaller amount of makeup air since smaller amounts of air are being exhausted.īest ventilation for mobile or dispersed contaminant sources. Requires large amounts of heated or cooled makeup air. Ineffective for dusts or metal fumes or large amounts of gases or vapours.Ĭan handle many types of contaminants including dusts and metal fumes.Įffective control for flammable or combustible gases or vapours. Requires regular cleaning, inspection and maintenance.Įffective control for small amounts of low toxicity chemicals. The only choice for highly toxic airborne chemicals. Higher cost for design, installation and equipment.Ĭannot be used for highly toxic chemicals.
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Usually lower equipment and installation costs.Ĭaptures contaminant at source and removes it from the workplace. The two types of ventilation, dilution and local exhaust, are compared in the following table. It is therefore unusual to recommend the use of dilution ventilation for the control of chemical substances except in the case of solvents which have admissible exposure concentrations of more than 100 parts per million.Īll industrial ventilation systems, when designed properly, should be able to provide long-term worker protection. the emission rate of contaminants is relatively uniform.workers do not carry out their tasks in the immediate vicinity of the source of contamination, and.the amounts of pollutants generated are not very high,.When used to control chemical pollutants, dilution must be limited to only situations where: 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. Dilution ventilation supplies and exhausts large amounts of air to and from an area or building.