US PATENT SUBCLASS 165 / 249
.~.~.~ Proportion of outdoor air and return air controlled

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}
249.~.~.~ Proportion of outdoor air and return air controlled {1}
250  DF  .~.~.~.~> Outdoor air used in lieu of operating heating or cooling means (e.g., economy cycle, etc.) {1}

DEFINITION

Classification: 165/249

Proportion of outdoor air and return air controlled:

(under subclass 248) Subject matter including means to recycle air in the area; and further including means to regulate the ratio of outdoor air relative to an amount of recycle air.