title: Effects of walk-by and sash movement on contaminant leakage of air curtain-isolated fume hood.
abstract: The effects of the walk-by motion and sash movement on the containment leakage of an air curtain-isolated fume hood were evaluated and compared with the results of a corresponding conventional fume hood. The air curtain was generated by a narrow planar jet issued from the double-layered sash and a suction slot-flow arranged on the floor of the hood just behind the doorsill. The conventional fume hood used for comparison had the major dimensions identical to the air-curtain hood. SF tracer-gas concentrations were released and measured following the prEN 14175-3:2003 protocol to examine the contaminant leakage levels. Experimental results showed that operating the air-curtain hood at the suction velocity above about 6 m/s and jet velocity about 1 m/s could provide drastically high containment performance when compared with the corresponding conventional fume hood operated at the face velocity of 0.5 m/s. The total air flow required for the air-curtain hood operated at 6 m/s suction velocity and 1 m/s jet velocity was about 20% less than that exhausted by the conventional fume hood. If the suction velocity of the air-curtain hood was increased above 8 m/s, the containment leakage during dynamic motions could be reduced to ignorable level (about 10(3) ppm).
authors.affiliation: Department of Mechanical Engineering, National Taiwan University of Science and Technology, Taipei, Taiwan, ROC.
authors.forename: Rong Fung
authors.initials: RF
authors.lastname: Huang
authors.forename: Hong Da
authors.initials: HD
authors.lastname: Chen
authors.forename: Chien-Hsiung
authors.initials: CH
authors.lastname: Hung
mesh_terms: D000392:Air Movements; D004867:Equipment Design; D005740:Gases / Q000032:analysis; D015386:Hazardous Substances / Q000032:analysis; D019570:Inhalation Exposure / Q000032:analysis / Q000517:prevention & control; D007753:Laboratories; D016273:Occupational Exposure / Q000032:analysis / Q000517:prevention & control; D012906:Smoke / Q000032:analysis; D014691:Ventilation / Q000295:instrumentation*
chemical_list: D005740:Gases; D015386:Hazardous Substances; D012906:Smoke