US PATENT SUBCLASS 454 / 300
.~.~.~.~ Concentric


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}
299  DF  .~.~.~ Including plural vanes {1}
300.~.~.~.~ Concentric


DEFINITION

Classification: 454/300

Concentric:

(under subclass 299) Subject matter wherein the slats or slat-like portions of the air directing means are located parallel to and nested within one another.

(1) Note. The concentric vanes need not be nested in the same general plane.

SEE OR SEARCH THIS CLASS, SUBCLASS:

310+, for concentric inlet air distributing louvers where the cooperation with the ceiling is not claimed.