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NTIS 바로가기American Industrial Hygiene Association journal, v.47 no.1, 1986년, pp.59 - 65
HAMPL, VLADIMIR (National Institute for Occupational Safety and Health, Division of Physical Sciences and Engineering, Robert A. Taft Laboratories, 4676 Columbia Parkway, Cincinnati, OH 45226) , HUGHES, ROBERT T. (National Institute for Occupational Safety and Health, Division of Physical Sciences and Engineering, Robert A. Taft Laboratories, 4676 Columbia Parkway, Cincinnati, OH 45226)
Experiments using the directed push-pull ventilation technique were conducted on a general type of local exhaust ventilation installation. The exhaust (pull) system consisted of a square hood, while the push system consisted of one or two slot jets or two round jets. The two slot or round jets were located behind and beside a mannequin (the mannequin simulated the worker's position). The one slot jet was located between the smoke source and the mannequin. Under experimental conditions, the push-pull system reduced the amount of smoke in the mannequin's breathing zone even when the exhaust system volume flow rate necessary for capture of the smoke decreased approximately 50%. Generally, no difference between the slot and round jet control performance was found. The experiments showed that the directed push-pull ventilation system can be used effectively to reduce the contaminant emission into a workroom, if the jets are located so that the eddy currents induced by the worker or other obstructions are minimized or eliminated.
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