This historical image was provided by the Center for Disease Control's (CDC), National Institute for Occupational Safety and Health (NIOSH). This composite, combining a photograph and illustration, depicted a Roto-Clone� exhaust ventilation hood, which was located inside the American Air Filter Co. in Louisville, Kentucky. The image revealed the details of a 'typical' hood and mixer configuration that was used when 'barrel-filling' with a chemical or pharmaceutical mixture.
CDC/ Barbara Jenkins, NIOSH
December 2, 2012
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