(under subclass 341) Subject matter having a readily shiftable orifice cap or closure portion which provides admittance by a human being to the air exhausting means.
(1) Note. The movable cover may also be used to affect the flow of air in some instances.
(2) Note. The specific means for permitting movement of the cover must be claimed for proper original patent placement in this subclass.
SEE OR SEARCH THIS CLASS, SUBCLASS:
4+, for a cap closure for a chimney or stacktop.
94, for a railcar, bus, or trailer having an exterior cap closure for a vent.
275, for an inlet airway having a specific cover or shield for an exterior vent opening.
347+, for an outlet airway having an air pump and which may include a readily moveable cover. 356, for an outlet airway having an air pump and including an exterior neck with an enlarged, weather resistant cover.
358+, for other outlet airways which may include a readily moveable cover.
367+, for other outlet airways with a specific cover or shield for an exterior vent opening.
