PURPOSE: To attach a small door to the fireproof door with a high working efficiency. ;CONSTITUTION: A notch part 4 which becomes a fire fighting hose passing hole is formed in the lower end part of a fireproof door 1 attached to the wall surface so as to be freely turnable in the periphery of a vertical axis center between a state that a passage is opened along the wall surface of the passage and a state that the passage is closed in order to cut off the passage of a building, and in this notch part 4, a small door unit 5 consisting of a frame 7 fixed to the fireproof door 1 with a screw 6, and a small door 9 supported so as to be freely turnable by this frame 7 is provided, so that the small door 9 can be attached to the fireproof door 1 by only screwing the frame 7 of the small door unit 5 to the fireproof door 1.;COPYRIGHT: (C)1994,JPO
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