US PATENT SUBCLASS 454 / 100
.~.~.~ Having forced recirulation means alone

Current as of: June, 1999
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454 /   HD   VENTILATION

69  DF  VEHICLE (E.G., AUTOMOBILE, ETC.) {15}
83  DF  .~ Railcar, bus, or trailer {10}
99  DF  .~.~ Having forced recirculation {1}
100.~.~.~ Having forced recirulation means alone {2}
101  DF  .~.~.~.~> Wind-operated fan
102  DF  .~.~.~.~> Wheel-axle operated fan

DEFINITION

Classification: 454/100

Having forced recirculation means alone:

(under subclass 99) 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 subclass.

SEE OR SEARCH THIS CLASS, SUBCLASS:

140, for other types of vehicles having forced recirculation

of vehicle air alone.

230+, for a static structure (e.g., building) having forced recirculation of ventilating air alone.