US PATENT SUBCLASS 454 / 331
.~.~.~ Including specific grating or grating mounting structure

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}
330  DF  .~.~ Having register box, frame, or grating {1}
331.~.~.~ Including specific grating or grating mounting structure {1}
332  DF  .~.~.~.~> Readily moveable grating

DEFINITION

Classification: 454/331

Including specific grating or grating mounting structure:

(under subclass 330) Subject matter wherein particular significance is attributed to (1) a grill-like exit structure or (2) a means for attaching a grill-like exit structure directly to a support.