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3008.5.2.2 Local Area Ventilation
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Where a local ventilation system is required by the regulations of the United States Department of Labor, such ventilation system shall be an independent, dedicated and nonrecirculating system that discharges directly outdoors or to an emission control system and only metallic ductwork impervious to ethylene oxide shall be used. The amount of flexible ducting and the number of elbows in the duct shall be kept to a minimum.