What is the purpose of a smokeproof enclosure in exit stairways of high-rise buildings?

The purpose of a smokeproof enclosure in exit stairways of high-rise buildings is to prevent smoke from entering the stairway. During a fire, smoke can spread rapidly and pose a significant risk to occupants trying to evacuate. A smokeproof enclosure is designed to create a barrier that keeps smoke from infiltrating the stairwell, thereby ensuring a clear and safe path for evacuation. This is particularly crucial in high-rise buildings where stairways serve as the primary means of escape and must remain accessible and safe from smoke for as long as possible.

While options related to natural ventilation, noise reduction, or providing extra space for emergency responders may be valid considerations in building design, they do not encapsulate the primary function of a smokeproof enclosure in this context. The main goal is to enhance safety by maintaining a smoke-free route for those exiting the building.