US PATENT SUBCLASS 454 / 273
.~.~.~ Having adjustable valve

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.~.~.~ Having adjustable valve {1}
274  DF  .~.~.~.~> Sliding or axially moveable

DEFINITION

Classification: 454/273

Having adjustable valve:

(under subclass 271) Subject matter comprising a positively repositionable device for regulating the quantity of airflow through the casing in the barrier.