US PATENT SUBCLASS 454 / 247
.~.~.~ Floor type

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}
245  DF  .~.~ Air distributor with return vent (e.g., register, etc.) {3}
247.~.~.~ Floor type

DEFINITION

Classification: 454/247

Floor type:

(under subclass 245) Subject matter wherein the single structure is located on or in an interior, bottom structural barrier of the ventilated space.