Wallenstein & Wagner, Ltd.
Independent directional-flow air ducts for low-profile window fan
 A window fan capable of permitting the flow of air in one of at least three different patterns, including intake, exhaust and a simultaneous exchange of air. The fan includes a housing, having front section including a forward inner wall, and a back section having a rearward outer wall. The housing further includes a pair of opposed projecting side walls having an elongated opening. Positioned within the elongated opening within the side walls are a pair of side panel assemblies comprised of expandable, accordion-style side panels secured within a side panel frame. Directional air flow through the housing is effectuated through the use of at least one impeller having a plurality of blades, located within the housing, in combination with a pair of rotatable C-shaped ducts. 
Lakewood Engineering and Manufacturing Co.
F
F24F
inventional
Yung Eleobardo
Chen Moreno