US PATENT SUBCLASS 454 / 228
HAVING FORCED RECIRCULATION

Current as of: June, 1999
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454 /   HD   VENTILATION

228HAVING FORCED RECIRCULATION {4}
229  DF  .~> Including automatic control means
230  DF  .~> Forced recirculation alone {3}
234  DF  .~> Including unitary housing having both inlet and outlet airways {1}
236  DF  .~> For use with heating and cooling means

DEFINITION

Classification: 454/228

HAVING FORCED RECIRCULATION:

(under the class definition) Subject matter comprising an air moving apparatus which contacts and directly forces air from one location within a (ventilated) space to another separate

location within the space.

(1) Note. This subclass includes a multi-compartmented structure such as a multiple room house provided the air flow path is recirculatory and not merely a flow-through ventilation path.

(2) Note. Subject matter comprising forced, "partial recirculation", wherein fresh air and recirculating air contact and are directly forced into the space by an air moving apparatus are included in this and indented subclasses unless otherwise indicated.

SEE OR SEARCH THIS CLASS, SUBCLASS:

99+, for forced recirculation in a railcar, bus, or trailer-type vehicle.

139+, for forced recirculation in other types of vehicles.

205, for recirculation combined with window features. 261+, for inlet airways which induce recirculatory air flow.