US PATENT SUBCLASS 454 / 29
.~.~.~ Continuously horizontal panel

Current as of: June, 1999
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454 /   HD   VENTILATION

1  DF  CHIMNEY OR STACK {6}
3  DF  .~ Chimneytop or stacktop structure (e.g., cowl) {12}
27  DF  .~.~ Having readily movable air current regulating means {3}
29.~.~.~ Continuously horizontal panel

DEFINITION

Classification: 454/29

Continuously horizontal panel:

(under subclass 27) Subject matter wherein the shiftable means comprises a multiposition plate which is maintained parallel to the horizon while in use and while motion is being imparted to it.

SEE OR SEARCH THIS CLASS, SUBCLASS:

348, and 362, for continuously horizontal damper panels used with outlet airways.