This is also a new design on the roof window market. Two sashes are placed in one window frame. The upper sash is opened like a pivot window but the axis of rotation is situated above the centre of the window. The lower sash is non-opening and incorporates glazing unit with internal laminated pane. This window obviates the need for vertical combinations offering larger glazed area.. In standard combination, the width of joining element is 30 cm, whereas in two-sash window it is only 15 cm. This window is offered in several sizes the tallest being 250cm. It is the only window on the market satisfying the requirements of DIN 5034-1 standard as room lighting when installed in roofs with pitches 30- 43 degrees. It is equipped with an automatic air inlet V40P.

U glazing =1.0 W/m²K

U window =1.4 W/m²K

V40P air inlet airflow rate: up to 48m3/h.