Louver assembly for fan discharge duct

An improved air conditioning system unit (10) comprising:

• a heat exchanger (12);
• a fan (6) disposed downstream of said heat exchanger;
• a discharge duct (41, 42, 8, 9) downstream of said fan, said duct having an upper wall surface (41A), a lower wall surface (42A) and side walls (8, 9);
• a louver assembly (20) disposed within said duct and including a pair of spaced apart slats (21, 22) extending between said side walls, said assembly being rotatable between a first position and second position, the first slat of said pair of slats being an upper slat having a first surface (21A) with generally the same contour as said upper wall surface, and the second slat of said pair of slats being a lower slat having a first surface (22A) with a contour generally the same as said lower wall surface;
• wherein said assembly is moveable between a first position wherein said first surface of said upper slat is adjacent and spaced from said upper wall surface to define a generally constant cross section upper outlet passageway (51), and a second position wherein said first surface of said lower slat is adjacent and spaced from said lower wall surface to define a generally constant cross section lower outlet passageway (50).