DachfenStar – large opening area; Two free floating window above the roof; Opening is electric or by hand to the left and to the right; Roof sliding windows made of fiberglass – environment friendly high quality material; Excellent thermal insulation properties and slim profil geometry; Roof window U-Frame heat transfer rate Uf= 0,57 – 0,75 W/²k; Low thermal expansion coefficient similar to the glass; Fast and uncomplicated installation; Shading options for inside and outside; Integrated shading via switchable sun protection glass