... and pocket 3) Thelargest open space can reach the 1/2, assuring good ventilation4) Good air-tightness, water-tightness, ... German ROTO, SIEGWNIA.Products & Service1) Can be used for new construction, remodeling or complete window replacement. Such as bedroom, kitchen ... room, bathroom, passageway, stair, roof and so on.2) Customized design, material, size, color, glass, finish3) Easy ...