US PATENT SUBCLASS 454 / 302
.~.~.~.~ Single, annular output slot

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  DF  .~.~ Ceiling type {4}
301  DF  .~.~.~ Including elongated output slot {2}
302.~.~.~.~ Single, annular output slot

DEFINITION

Classification: 454/302

Single, annular output slot:

(under subclass 301) Subject matter wherein the oblong airway opening is in the shape of a lone, closed ring.

(1) Note. The ring need not be circular to be considered annular.