US PATENT SUBCLASS 454 / 230
.~ Forced recirculation alone

Current as of: June, 1999
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454 /   HD   VENTILATION

228  DF  HAVING FORCED RECIRCULATION {4}
230.~ Forced recirculation alone {3}
231  DF  .~.~> Having recirculating duct connecting upper and lower room air strata
232  DF  .~.~> Having plural or branched recirculation ducts
233  DF  .~.~> For use with heating or cooling means

DEFINITION

Classification: 454/230

Forced recirculation alone:

(under subclass 228) Subject matter wherein the air moving apparatus contacts and directly moves only existing air within the ventilated space.

(1) Note. Subject matter including means for also introducing air from outside of the ventilated space into the space is excluded from this and indented subclasses.

SEE OR SEARCH THIS CLASS, SUBCLASS:

100+, for a railcar, bus, or trailer having forced recirculation of vehicle air alone.

140, for other types of vehicles having forced recirculation of vehicle air alone.