US PATENT SUBCLASS 454 / 361
.~.~ Internal damper

Current as of: June, 1999
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454 /   HD   VENTILATION

339  DF  HAVING OUTLET AIRWAY {7}
358  DF  .~ Having readliy movable air regulating louver, damper, or cover {3}
361.~.~ Internal damper {2}
362  DF  .~.~.~> Continuously horizontal damper panel
363  DF  .~.~.~> Pivoted damper panel

DEFINITION

Classification: 454/361

Internal damper:

(under subclass 358) Subject matter wherein the air exhausting means includes an easily shiftable air permitting or preventing inner body which is configured such that it remains completely within the confines of the air exhausting means in all of its shifted positions.