Fume hood with air chamber and pressure pipe
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United States of America Patent
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May 27, 2003
Grant Date -
Feb 6, 2003
app pub date -
Dec 11, 2001
filing date -
Aug 3, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A fume hood includes a top, bottom sidewalls, front panel and a back panel that define an enclosed workspace. The fume hood also includes a movable sash for opening and closing an access opening. The fume hood also includes an air chamber having an inlet in the front panel. The air chamber includes a baffle system that evenly distributes the inlet air as the air travels through the air chamber. An unimpeded flow of air is discharged downward and away from the breathing zone of the technician and proximate to the sash to reduce the forward momentum of air trying to escape the fume hood. In an alternate embodiment, the fume hood also includes a pressure pipe for drawing a small quantity of air from the air chamber and directing a flow of air between the movable sash and the header panel. This flow of air from the pressure pipe increases the relative pressure difference between the movable sash and the header panel of the fume hood. This design reduces the amount of condition air that is exhausted from the room through the fume hood, thereby lowering the operating cost and increasing the efficiency of the fume hood.
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