US PATENT SUBCLASS 165 / 252
.~.~.~ Pre-heat or pre-cool of outdoor air before mixing with returned air

Current as of: June, 1999
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165 /   HD   HEAT EXCHANGE

200  DF  WITH TIMER, PROGRAMMER, TIME DELAY, OR CONDITION RESPONSIVE CONTROL {14}
201  DF  .~ Having heating and cooling capability {13}
248  DF  .~.~ Flow of air from outdoors controlled (e.g., minimum outside air, etc.) {2}
252.~.~.~ Pre-heat or pre-cool of outdoor air before mixing with returned air

DEFINITION

Classification: 165/252

Pre-heat or pre-cool of outdoor air before mixing with returned air:

(under subclass 248) Subject matter including means to recycle air in the area; and wherein the admitted outdoor air is heated or cooled by passing through a heating or cooling means before mixing with the recycle air in the area.

SEE OR SEARCH CLASS

62, Refrigeration,

95, for refrigeration processes including plural cooling (e.g., precooling by exhaust, etc.).