(under subclass 361) Subject matter wherein the air permitting or preventing inner body is an air engaging and controlling plate which is always maintained in a position parallel to the horizon while motion is being imparted to it and while it is being used.
SEE OR SEARCH THIS CLASS, SUBCLASS:
29, for chimneytop or stacktop structure having a continuously horizontal damper panel which is readily movable to regulate an air current.
348, for an outlet airway having an air pump and a continuously horizontal damper panel.
