FIELD: designs of flat fireproof doors. SUBSTANCE: fireproof door has door with water vessel. It is provided with button water valve locked with engagement and whose inlet is connected with perforated tube by metal rod with high linear expansion coefficient at temperature of 200 C. Door is wooden with metal sheet. Valve is made with cast plugs in its upper part. Tube is made with decorative apron for possible formation of water curtain under gravity, in case of fire, on door external surface up to full emptying. Horseshoe-shaped vessel with disinfected water is arranged above door on external side. Perforated tube is located above door on side of stairway. Rod is located with clearance relative to valve and thrusts it with attaining temperature of 200 C. EFFECT: reduced weight of door and higher convenience in operation. 6 cl, 3 dwg
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