The Velux FO6 GPU only (Size 66cm wide x 118cm long)top hung window with it's comfortable operation top-hung roof windows feature a conveniently placed bottom handle, with operation assisted by powerful yet gentle springs. Combines dual function of a top-hung roof window with emergency escape/access This window has only one finish (GPU)White polyurethane finish (EVERfinish?) The VELUX roof window has proved itself over many years. If you are looking for a Top Hung window, you should choose the VELUX GPU Top Hung roof window.