US PATENT SUBCLASS 454 / 292
.~.~ Ceiling type

Current as of: June, 1999
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454 /   HD   VENTILATION

254  DF  HAVING INLET AIRWAY {11}
284  DF  .~ Including specific air distributor (e.g., register, etc.) {14}
292.~.~ Ceiling type {4}
293  DF  .~.~.~> With light fixture {2}
296  DF  .~.~.~> Including perforated or porous element {1}
299  DF  .~.~.~> Including plural vanes {1}
301  DF  .~.~.~> Including elongated output slot {2}

DEFINITION

Classification: 454/292

Ceiling type:

(under subclass 284) Subject matter wherein the air directing means is located on or in an interior, top structural barrier of the ventilated space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

306, for an air duct extending into the room and often suspended from the ceiling.