| 摘要 |
<p>A displacement flow fume hood (300) is provided having an adequate level of safety while reducing the amount of air exhausted from the hood. The displacement flow includes a plurality of air supplies (314, 325, 343) which provide fresh air, preferably having laminar flow, to the fume hood. The displacement flow fume hood (300) also includes an air exhaust (340) which pulls air from the work chamber (302) in a minimally turbulent manner. As the displacement flow produces a substantially consistent and minimally turbulent flow in the hood, inconsistent flow patterns associated with contaminant escape from the hood are minimized. The displacement flow fume hood (300) in accordance with one embodiment of the present invention largely reduces the need to exhaust large amounts of air from the hood. It has been shown that exhaust air flow reductions of up to 70 % are possible without a decrease in the hood's containment performance.</p> |
