US PATENT SUBCLASS 454 / 62
.~.~.~ Plural airways with adjustable distribution 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}
61  DF  .~.~ Having outlet airway flow adjustment means {1}
62.~.~.~ Plural airways with adjustable distribution means

DEFINITION

Classification: 454/62

Plural airways with adjustable distribution means:

(under subclass 61) Subject matter comprising two or more passages for exhausting air from the task area and further comprising means to alter amounts of the air exhausting through one of the passages relative to another of the passages.

(1) Note. The two or more passages may connect to a common outlet or suction pipe.