US PATENT SUBCLASS 165 / 248
.~.~ Flow of air from outdoors controlled (e.g., minimum outside air, etc.)

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.~.~ Flow of air from outdoors controlled (e.g., minimum outside air, etc.) {2}
249  DF  .~.~.~> Proportion of outdoor air and return air controlled {1}
252  DF  .~.~.~> Pre-heat or pre-cool of outdoor air before mixing with returned air

DEFINITION

Classification: 165/248

Flow of air from outdoors controlled (e.g., minimum outside air, etc.):

(under subclass 201) Subject matter including a means to regulate the amount of outdoor air admitted to the heated or cooled area.

SEE OR SEARCH CLASS

236, Automatic Temperature and Humidity Regulation,

49.1, 49.5 for automatic temperature and humidity control of ventilators.

454, Ventilation,

70, 238, 255, and 340 for devices for maintaining the pressure in an enclosure where no specific heating or cooling means are included; subclasses 228+ for ventilating system having forced recirculation; subclass 239 for control of ventilating system having inlet and outlet airways; subclass 256 for control of ventilating system having inlet airway; and appropriate subclasses for apparatus for supplying air to, removing it from, or distributing air in an enclosure with or without heating and without a specific heat exchange means.