US PATENT SUBCLASS 454 / 295
.~.~.~.~ Having adjustable 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}
292  DF  .~.~ Ceiling type {4}
293  DF  .~.~.~ With light fixture {2}
295.~.~.~.~ Having adjustable valve

DEFINITION

Classification: 454/295

Having adjustable valve:

(under subclass 293) Subject matter wherein the air directing means includes a positively repositionable means for regulating the airflow quantity.

(1) Note. Opening or closing of an airflow quantity regulating means by air pressure alone is not considered to be positive repositioning thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

311, for an inlet air distributer having a louver with concentric vanes and separate, adjustable internal damper.

333+, for other types of inlet airways with adjustable valves.