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welcome to this weeks two minute tuesday when were talking about fire safety and smoke ventilation youll often come across the term protected stairway it may be one of those things that youve grown used to hearing but you dont actually know what its referring to so heres a short explanation of the term protected stairway [Music] approved document b of the building regulations defines a protected stairway as a stair discharging through a final exit to a place of safety that is adequately enclosed with fire resistant construction it also includes any exit passageway between the foot of the stair and the final exit a protected stairway is designed to provide a virtually fire sterile area which leads to places of safety outside the building once inside a protected stairway a person can be considered safe from immediate danger from flames and smoke they can then proceed to a place of safety at their own pace to enable this to be done flames and smoke and toxic gases must be excluded