US PATENT SUBCLASS 454 / 310
.~.~.~ 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}
309  DF  .~.~ Louvered air distributor {3}
310.~.~.~ Concentric {2}
311  DF  .~.~.~.~> Having separate, adjustable internal damper
312  DF  .~.~.~.~> Having adjustable vane

DEFINITION

Classification: 454/310

Concentric:

(under subclass 309) Subject matter wherein the slats or slat portions of the air directing means are located parallel to and nest within one another.

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

SEE OR SEARCH THIS CLASS, SUBCLASS:

300, for concentric air distributing vanes cooperating with a claimed ceiling air distributor.