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非防护区：指防护密闭门(及防爆波活门)以外的空气冲击波能够自由传播的区域。非防护区一般包括防护密闭门外的通道、楼梯间、竖井以及相邻的普通地下室等。

7

清洁区：在有人员停留的防空地下室中不仅满足防爆波要求，而且满足防毒剂、防辐射要求的区域，即指室内满足集体防护要求(掩蔽人员不需要配戴防护器材)的区域。清洁区的范围是指有人员停留的防空地下室中最里面一道密闭门以内的部分。