A fire-blast resistant window assembly comprising a sash to be built in a window opening, a glazing system and a face multiple glass unit covering the sash from a front side of the sash, characterized in that
- the face multiple glass unit is mounted on the sash so that a thermal break in the form of a thermal insulation material layer is formed therebetween;
- the sash comprises a metallic framework with a face part and a back part, a surface of the metallic framework facing inside the window opening delimits a mounting aperture for the glazing system, wherein metallic separating plates are welded to the face part of the framework, along the perimeter of said mounting aperture, so as to provide spacings therebetween;
- the glazing system contains a first and a second glazing unit, wherein a first glazing unit is installed in said mounting aperture in the face part of the metallic framework of the sash as a fixed leaf, and comprises:
- a first metallic support contour made of a first angular profile, wherein a first flange of the first angular profile is welded to said separating plates and is directed inwards to a room, while a second flange of the first angular profile protrudes inside the mounting aperture, thereby forming a first support lug;
- a first glazing sheet inserted on a back side of the first metallic support contour so that it abuts against said first support lug, and
- first metallic glazing beads fastened on a back side of the first glazing sheet by means of bolted connections to the flange welded to the separating plates so that the first glazing sheet is pressed to said first support lug,
- wherein a layer of a refractory material is interposed between the first glazing sheet and adjoining thereto surfaces of the first support lug and of the first metallic glazing beads of the first glazing unit, wherein said layer forms a thermal break therebetween;
- the second glazing unit is installed in said mounting aperture in the back part of the metallic framework of the sash and comprises a second metallic support contour made of a second angular profile, wherein a first flange of the second angular profile protrudes inside the mounting aperture, thereby creating a second support lug, a second glazing sheet inserted with an abutment in said second support lug, and second metallic glazing beads pressing the second glazing sheet to said second metallic support contour, the first and second metallic glazing beads consisting of pipe sections with rectangular cross-section,
- wherein a layer of a refractory material is interposed between the second glazing sheet and adjoining thereto surfaces of the second metallic support contour and of glazing beads of the second glazing unit, wherein said layer forms a thermal break therebetween, and the second metallic support contour of the second glazing unit is fastened to the metallic framework of the sash by means of bolted connections so as to obtain a sealing between the sash and the second glazing unit.