Abstract: A jalousie window construction includes reinforced side jamb sections, full perimeter sealing for the window slats when the slats are closed and stackability of a plurality of the window constructions with the side jamb section reinforcement also functioning as reinforcement between adjacent stacked window constructions. The jalousie window construction further provides improved smooth and reduced friction pivoting of the plurality of slats thereof as well as reinforcement of the pivot shaft assemblies from which the slats are supported. The window construction also affords improved unobstructed viewing therethrough and includes a concealed mechanism for changing the angle of the pivotable slats.