(under subclass 200) Subject matter comprising means for circulating or moving a portion of air from one position in the ventilated space to another position within the space.
(1) Note. Subject matter comprising forced, "partial recirculation", wherein fresh air and recirculating air contact and are directly forced into the space by an air moving apparatus are included in this and indented subclasses unless otherwise indicated.
SEE OR SEARCH THIS CLASS, SUBCLASS:
99+, for forced recirculation in a railcar, bus, or trailer-type vehicle.
139+, for forced recirculation in other types of vehicles.
228+, for recirculation in a static structure (e.g., building).
261+, for inlet airways which induce recirculatory air flow.
