| 摘要 |
PROBLEM TO BE SOLVED: To provide a fire sheet shutter having excellent fire prevention and smoke prevention performances while forming an evacuation exit opening part satisfactorily and capable of returning to an original completely closed condition automatically after a door sheet is opened and providing secure fire and smoke prevention performances after an evacuation exit is used. SOLUTION: A door cover is provided to cover an open side end part of the door sheet, and at least a side part positioned on an evacuation exit side of the door cover has higher rigidity than the other fire sheet parts.
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