题目内容

下列关于防排烟设施要求说法正确的有()

A. 防烟卷帘要求气密性好,不般不超过5m,设置在走道时落下高度距地1.8m以上;
B. 当烟气温度超过280℃时,排烟防火阀自动开启;
C. 固定式挡烟板和挡烟梁要求突出顶棚≥0.5m;
D. 防火卷帘和活动式挡烟板通常与火灾自动报警探测器联动

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