US PATENT SUBCLASS 454 / 179
.~.~.~ Horizontal duct

Current as of: June, 1999
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454 /   HD   VENTILATION

173  DF  STORAGE AREA FOR PERISHABLES {2}
174  DF  .~ Harvested crop ventilation {2}
175  DF  .~.~ Having perforated or slotted duct contacting crop {4}
179.~.~.~ Horizontal duct {1}
180  DF  .~.~.~.~> With air pump

DEFINITION

Classification: 454/179

Horizontal duct:

(under subclass 175) Subject matter wherein the conduit extends parallel to the force of gravity.

(1) Note. A perforated, ventilating floor duct is included in this subclass.