FIELD: construction; window designs. SUBSTANCE: window has casing and one or several frames. Frame member surfaces facing the casing and casing surfaces corresponding to them are arranged at acute angle to the plane of glass installed in the frame. Cross-section of each member of each frame is of square or rhomb in shape. The sides of the latter are located at acute angle to glass plane. Glass is fastened along ribs of the frame opposite members. The surface of members of one frame located over the internal perimeter is attached opposite to the surface of members of other frame located over the external perimeter. In this case, the second frame is secured in the casing relative to the first frame from the window external side. For the three frames secured successively in the casing, the surface of members of the window internal frame located over its internal perimeter is arranged opposite to the surface of members of the middle frame located over external perimeter. EFFECT: higher efficiency. 3 cl, 7 dwg
