FIELD: construction.
SUBSTANCE: invention relates to area of fire-resistant doors, impenetrable for the fluid medium, for buildings or structures. The door contains, from one side, a fixed frame and at least one active door and, from another side, a sealing fixture which provide tightness between the fixed frame and the active door when the door is closed. The named or each active door contains, from one side, the housing enclosing the empty space implemented with a possibility of accommodating or forming of a heat insulator and located between two layers of heat insulation, each of which, in essence, is made of the material with low heat conductivity or diffusive properties, and, from another side, in case of necessity at least one thermogap.
EFFECT: long-term resistance to temperature increase of one side of a door at contact of its other side with fire.
15 cl, 3 dwg
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