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《高层民用建筑设计防火规范》５．１．４条规定：高层建筑内设有上下层相连通的走廊、敞开楼梯、自动扶梯、传送带等开口部位时，应按上下连通层作为一个防火分区，其允许最大建筑面积之和不应超过本规范５．１．４条的规定。当上下开口部位设有耐火极限大于３．００ｈ的防火
Section 5.1.4 of the Code for Fire Protection of High-rise Civil Buildings stipulates that corridors connected to the upper and lower floors in high-rise buildings should be used as a fire prevention partition when the open places such as stairs, escalators and conveyors are opened. The sum of the maximum allowable building area shall not exceed the requirements of 5.1.4 of this code. When the upper and lower openings with fire resistance greater than 3.00h fire