Outdoor stairs and enclosed stairs of evacuation stairs

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Provisions of Code for Building Design GB50016-2014: 3.7.6 Evacuation stairs in high-rise factories and multi-story factories of categories A, B, and C shall be enclosed stairwells or outdoor stairs. For factories with a building height of more than 32 meters and more than 10 people on any floor, smoke-proof stairwells or outdoor stairs should be used. Regarding this point, there are several questions: 1. If the corresponding evacuation staircase is an outdoor staircase, is it then unnecessary to use a enclosed staircase? 2. For factory buildings with steel frame structures, how should outdoor stairs be distinguished from indoor stairs? For example, in a steel frame factory building there are several stairs that have the same structure but are located in different places; if one of these stairs is situated right outside the frame, then is it an outdoor stair or an indoor stair?