Is characterized by:
      - window block including aperture box and casements with double glass panes;
      - hermetically sealed double glass pane;
      - casement which can be opened in different directions;
      - latches with accessories of central opening;
      - material of manufacture: wood;
      - decorative and protective covering of wood;
has the following features:
      - aperture box and casements are made of several-ply glued beam;
      - the adjustment of glazing bead of double glass pane is concealed;
      - the tightening of rabbet ledge is double;
      - water proof aluminium profile is installed in the aperture box;
      - presence of climate-box (ventilation device) (for variants 2 and 3)