US PATENT SUBCLASS 454 / 318
.~.~.~.~ Louver vanes form valve

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}
313  DF  .~.~.~ Moveable {5}
318.~.~.~.~ Louver vanes form valve

DEFINITION

Classification: 454/318

Louver vanes form valve:

(under subclass 313) Subject matter wherein the relocatable slats or slat portions themselves form a means for regulating the quantity of airflow.