| abstract |
A louver having a frame and a set of vanes mounted for pivotal movement about axes of rotation characterized by a rack and pinion operating the vanes, the rack being affixed to a plurality of co-engaging members that snap together to encompass a horizontal vane in the louver to facilitate assembly. In another aspect, the louver is characterized by the vanes having pins, or stub shafts, disposed in notches along at least one side of the frame and a snap-on strip for that side of the frame to hold the vanes in place. Moreover, the vanes overlap so that they can completely block flow of a fluid through the louver. Specific structural features such as the protrusions of the snap-on strip engaging apertures in the frame, are also disclosed. |