US PATENT SUBCLASS 454 / 280
.~.~.~.~ Formed in sheet member

Current as of: June, 1999
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454 /   HD   VENTILATION

254  DF  HAVING INLET AIRWAY {11}
275  DF  .~ Including specific cover or shield for exterior vent opening {1}
276  DF  .~.~ Wall type {1}
277  DF  .~.~.~ Louver {5}
280.~.~.~.~ Formed in sheet member

DEFINITION

Classification: 454/280

Formed in sheet member:

(under subclass 277) Subject matter comprising a single plate element having two or more ventilating air passages therethrough.