| 摘要 |
<p>A total exhaust laminar flow biological fume hood safety cabinet is disclosed having a closed housing with a viewing panel and access port therebetween at its front portion. Centrally a work tray is mounted with means permitting air passage thereabout. A plenum chamber connects the lower portion of the housing to the top, and an exhaust blower in closed pneumatic communication with the plenum delivers contaminated air to an exhaust filter for total exhaust. Makeup air means are provided at the upper portion of the housing to deliver filtered air downwardly over the work tray, and the blower capacities, flow rates, and filter capacitites are developed to the end that the air passing through the access port exceeds the quantity of filtered makeup air while providing for an access air velocity at least double that of the makeup air velocity.</p> |
