US PATENT SUBCLASS 454 / 27
.~.~ Having readily movable air current regulating means

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.~.~ Having readily movable air current regulating means {3}
28  DF  .~.~.~> With temperature sensitive release
29  DF  .~.~.~> Continuously horizontal panel
30  DF  .~.~.~> Pivoted {1}

DEFINITION

Classification: 454/27

Having readily movable air current regulating means:

(under subclass 3) Subject matter wherein the structure comprises a means which is easily shiftable to alter flow of air or products of combustion through the vertical conduit section.

(1) Note. A means held in a single fixed position by a separate movable screw or bolt or other permanent-type tool actuated fastener is not considered "readily movable."

SEE OR SEARCH THIS CLASS, SUBCLASS:

26, for a chimneytop or stacktop structure having air current regulating means which is air current responsive.

347+, and 358, for other types of outlet ventilators with a readily movable louver, damper, or cover.

355, for an air pump outlet airway with a movable access cover which also may affect the flow of air.

SEE OR SEARCH CLASS

126, Stoves and Furnaces, 285+, for chimney or stack dampers, per se, not incorporated in chimneytop or stacktop structure.