US PATENT SUBCLASS 454 / 327
.~.~.~ Valve opens by pivoting in upstream direction

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}
322  DF  .~.~ With adjustable valve {4}
327.~.~.~ Valve opens by pivoting in upstream direction

DEFINITION

Classification: 454/327

Valve opens by pivoting in upstream direction:

(under subclass 322) Subject matter wherein the air regulating means comprises an element which opens by rotating about a fixed axis toward the source of the air being admitted to the ventilated space.

(1) Note. This device is often referred to as an inward pivoted valve and usually is composed of a pivoting blade or panel.