The door has a swivelable active wing (1) and a swivelable passive wing (2), where each wing has two parallel flat gratings (3) with frames (4) that are bent crosswise. A space between the gratings is filled with a filling (6) of a non-combustible heat insulating material. One of the wings has a vertical stop bar on its frame which rests on the grating of the adjacent wing. A stop bar (11) of an arm (8) forms a T-cross section (7) and is made of a non-metallic fire proof material, where an arm (9) of the section located opposite to a web-piece (10) is fixed on the frame of one of the wings.
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