US PATENT SUBCLASS 454 / 52
.~.~.~ Ceiling inlet

Current as of: June, 1999
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454 /   HD   VENTILATION

49  DF  WORKSTATION VENTILATOR (E.G., HOOD, OFFTAKE, ETC.) {5}
50  DF  .~ Spray booth {2}
51  DF  .~.~ Having air inlet separate from access opening {1}
52.~.~.~ Ceiling inlet

DEFINITION

Classification: 454/52

Ceiling inlet:

(under subclass 51) Subject matter wherein the inlet passage admits air to the task area through a structural barrier above the area.