When setting positive pressure mechanical air supply system in smoke controlling stair hall, the outer window in the hall must be fixed.
楼梯间设置正压送风系统时，楼梯间设置的外窗应明确为固定窗；
When setting positive pressure mechanical air supply system in smoke controlling stair hall, the outer window in the hall must be fixed.
楼梯间设置正压送风系统时，楼梯间设置的外窗应明确为固定窗；
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