What are the conditions for setting up a smoke staircase?
6.2.1 A class of buildings and buildings with a height of more than 32m in addition to the modular and corridor-style residences and tower-type houses shall be fitted with smoke staircase. The setting of the smoke staircase should meet the following requirements:
?6.2.1.1 Stairway entrance should be located at the entrance, balcony or corridor.
?6.2.1.2 the area of ??the front room, public buildings should not be less than 6.00m2, residential buildings should not be less than 4.50m2.
6.2.1.3 The doors in the front and staircase shall be Class B fire doors and shall be opened in the evacuation direction.
6.2.3 Unit-type residential evacuation stairs for each unit shall be accessible to the roof, and the evacuation staircase shall be provided in accordance with the following provisions: 6.2.3.1 Units of 11 and 11 floors may not be closed, But open to the staircase of the door should be B fire doors, and the stairs should rely on the external walls, and should be natural and natural ventilation and natural ventilation.
6.2.3.2 Closed stairwells shall be provided for unitary dwellings of twelve and eighteen floors.
6.2.3.3 Blocks of non-smoking staircases shall be located in units of nineteenth and nineteenth floors.
6.2.4 Corridor-style houses below the 11th and 11th floors shall be enclosed in stairwells. Corridors with more than 11 floors shall be equipped with smoke staircase.
6.2.5 Stairway and smoke staircase front room should meet the following requirements:
6.2.5.1 Stairway and smoke staircase The inner wall of the front room shall not be opened except for the evacuation doors leading to public walkways and the doors specified in Article 6.1.3 of this Code.
6.2.5.2 Stair stairs and smoke staircase should not be laid in the front of the combustible gas pipeline and A, B, C liquid pipeline, should not affect the evacuation of the protrusion.
6.2.5.3 Gas pipelines in residential buildings shall not pass through the stairwells and shall be protected by steel casing when they must pass through the stairwell and shall comply with the relevant provisions of the existing national standard "Code for Town Gas Design".
6.2.2 Podiums and second-class buildings with a height of not more than 32m in addition to modular and corridor-style residences shall be enclosed in stairwells. Closed stairwell settings should meet the following requirements:
?6.2.2.1 Stairway should be made to the external walls and should be directly natural and natural ventilation, when not directly natural lighting and natural ventilation, should be set according to smoke staircase regulations.
6.2.2.2 There shall be Class B fire doors in the stairway and shall be opened in the direction of evacuation.
?6.2.2.3 The first floor of the staircase immediately after the main exit, the walkway and hall can be included in the staircase, the formation of the expansion of the closed staircase, but should be used fire safety doors and other fire measures and other walkways and rooms separated The
