GB 50116-2013 第4.5.1条
| Fire shutter linkage: Fire shutters on evacuation routes shall descend in two stages (stop at 1.8 m above the floor, then descend to the floor after a delay).
| Fire shutter linkage: Fire shutters on evacuation routes shall descend in two stages (stop at 1.8 m above the floor, then descend to the floor after a delay).
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