An outward opening window unit includes: a fixed frame, a movable frame connected to the fixed frame through hinge arms; an operating unit located on the fixed frame to move the movable frame; a structure to close the movable frame on the fixed frame; a handle associated with the fixed frame and connected to the operating unit. The fixed frame has a perimeter channel defining a groove provided with two undercuts for the coupling of operating rods connected to the operating unit, a corner element for transmission of motion being positioned at a corner formed by the fixed frame; the corner element is provided with a structure configured to connect two corresponding rods so as to synchronize the movement imparted to them by the operating unit.