US PATENT SUBCLASS 454 / 274
.~.~.~.~ Sliding or axially moveable


Current as of: June, 1999
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454 /   HD   VENTILATION

254  DF  HAVING INLET AIRWAY {11}
270  DF  .~ Sleeved vent for ceiling, wall, or floor (e.g., thimble) {1}
271  DF  .~.~ Wall type {2}
273  DF  .~.~.~ Having adjustable valve {1}
274.~.~.~.~ Sliding or axially moveable


DEFINITION

Classification: 454/274

Sliding or axially moveable:

(under subclass 273) Subject matter wherein the regulating means (1) relocates along a path parallel to a general direction of airflow immediately prior to its contact with the means or (2) comprises a portion which translates along another portion of the means.

(1) Note. Regarding (2), above, the airflow regulating means usually comprises two adjacent surface elements each having a group of holes therethrough, wherein the two elements translate relative to one another to vary airflow by bringing the groups of holes into and out of alignment with one another.