US PATENT SUBCLASS 454 / 242
.~.~ Rooftop

Current as of: June, 1999
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454 /   HD   VENTILATION

237  DF  HAVING BOTH INLET AND OUTLET AIRWAYS {6}
241  DF  .~ Including unitary inlet and outlet housing {4}
242.~.~ Rooftop

DEFINITION

Classification: 454/242

Rooftop:

(under subclass 241) Subject matter wherein the single structure is located on or in an outdoor exposed, top barrier of the ventilated space.

(1) Note. A conduit which passes through the roof to conduct air to and from an area immediately below the roof is proper for this subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

1+, for specific chimney or stack structure wherein air communicates with an area substantially below the roof proper.