US PATENT SUBCLASS 454 / 321
.~.~.~ In housing within room

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}
309  DF  .~.~ Louvered air distributor {3}
321.~.~.~ In housing within room

DEFINITION

Classification: 454/321

In housing within room:

(under subclass 309) Subject matter wherein the slats or slat portions are part of an enclosure which is positioned substantially inside the ventilated space.

(1) Note. A register located within a ceiling, floor, or wall which includes a portion which projects into the ventilated space is not included in this subclass.