הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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哦,好的。我看写了封闭楼梯间不满足自然通风条件可以设置机械加压送风系统或者采用防烟楼梯间,我认为不需要考虑机械加压送风了。