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Investigation of the parameters that influence the effectiveness of a bench top partial enclosure
Bench top partial enclosures are frequently used in industry to control airborne contaminants. These hoods tend to be of basic design and often consist of nothing more than a box like structure with an open front to allow worker access and extraction at the rear to remove contaminated air. With this type of design the worker is forced to stand at the face of the enclosure and by doing so presents a blockage to the airflow that creates a ‘wake' in front of the worker. Any release of contaminant into the recirculating wake region has the propensity to enter the worker's breathing zone...

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