Stairways serving a floor level more than how many feet below the finished floor of its level exit discharge must comply with smokeproof enclosure requirements?

Stairways that serve a floor level more than 30 feet below the finished floor of its level exit discharge must meet smokeproof enclosure requirements due to safety regulations aimed at protecting occupants during an emergency, particularly during a fire. The rationale behind this requirement is that as the height of the stairway increases, the risk of smoke accumulation and its potential to hinder safe egress increases. Smoke can travel upwards, and if the stairway is too deep, occupants may encounter smoke before reaching a safe exit. Therefore, the enforcement of smokeproof enclosure standards at this 30-foot threshold ensures that the stairways provide a safe, clear path for evacuation, maintaining adequate visibility and air quality for occupants fleeing a hazardous situation. This requirement is critical in ensuring that the building's design adheres to life-safety codes, which are intended to minimize risks during emergencies.