US PATENT SUBCLASS 454 / 60
.~.~.~ And air outlet through access opening

Current as of: June, 1999
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454 /   HD   VENTILATION

49  DF  WORKSTATION VENTILATOR (E.G., HOOD, OFFTAKE, ETC.) {5}
56  DF  .~ Covered workbench chamber (e.g., fume hood, etc.) {2}
57  DF  .~.~ Having air inlet separate from access opening {2}
60.~.~.~ And air outlet through access opening

DEFINITION

Classification: 454/60

And air outlet through access opening:

(under subclass 57) Subject matter wherein air is exhausted from the task area by way of the aperture which allows admittance to the task area by the operator.