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Stairway towers in code

When a building's height is greater than or equal to 75 feet, at least one of the required exits must be: 
A. a fire tower,  B. a smoke proof tower,  C. a smoke proof enclosure,  D. B+C but not A, E. A, B+C

Answer is E.

A, B and C all refer to an enclosed stairway constructed to be noncombustible, designed to provide a refuge for occupants to safely leave the building.

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