US PATENT SUBCLASS 454 / 58
.~.~.~ Including flow adjustment means

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}
58.~.~.~ Including flow adjustment means {1}
59  DF  .~.~.~.~> Responsive to position of access door

DEFINITION

Classification: 454/58

Including flow adjustment means:

(under subclass 57) Subject matter comprising means to alter direction or rate of air flow through the inlet passage.