US PATENT SUBCLASS 454 / 311
.~.~.~.~ Having separate, adjustable internal damper

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  DF  .~.~.~ Concentric {2}
311.~.~.~.~ Having separate, adjustable internal damper

DEFINITION

Classification: 454/311

Having separate, adjustable internal damper:

(under subclass 310) Subject matter wherein the air directing means includes, in addition to the slats or slat-like portions, a positively repositionable, air permitting or preventing inner body which is configured such that it remains completely within the confines of the air directing means in all of its positions.

(1) Note. Opening or closing of a damper by air pressure alone is not considered to be positive repositioning thereof.

SEE OR SEARCH THIS CLASS, SUBCLASS:

295, for an inlet ceiling-type air distributor and light having an adjustable valve.

312, for an inlet airway with concentric air distributing vanes and an adjustable vane for directing the air.

333+, for an inlet airway having an adjustable valve.