A window
assembly configured for installation in a recessed window aperture comprises one or more transparent
fixed position panes, one or more sliding panes, and a mounting frame. The mounting frame comprises at least a substantially full-circumference, molded plastic frame member and reinforcement integral with the frame member. The mounting frame at least partially defines a
window opening. The mounting frame, e.g., the frame member, forms upper and lower slider runways extending laterally above and below the
window opening. The sliding pane is slidably positioned in the upper and lower slider runways for sliding movement between open and closed positions. The mounting frame mounts the
fixed position pane(s) by
adhesive surface bonding to the interior surface of the
fixed position pane. The exterior surface of the fixed position pane is free of
adhesive. At least a laterally outboard portion of the
peripheral edge of the fixed pane is covered by a portion of the frame member which also is flush with the adjacent exterior surface of the fixed position pane. A show-surface portion of the full-circumference, molded plastic frame member forms the entire show surface of the window
assembly for at least a laterally extending portion the window
assembly above and / or below the
window opening. The reinforcement comprises an elongate reinforcing member(s) extending laterally above and / or below the window opening.