US PATENT SUBCLASS 454 / 249
.~.~ With air pump

Current as of: June, 1999
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454 /   HD   VENTILATION

237  DF  HAVING BOTH INLET AND OUTLET AIRWAYS {6}
241  DF  .~ Including unitary inlet and outlet housing {4}
249.~.~ With air pump

DEFINITION

Classification: 454/249

With air pump:

(under subclass 241) Subject matter comprising an air moving apparatus for forcing air into or out of the ventilated space.

SEE OR SEARCH THIS CLASS, SUBCLASS:

105, for a railcar, bus, or trailer which includes both inlet and outlet airways and an air pump.

243+, for a sleeved vent having both inlet and outlet airways and further including an air pump.