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Egress from habitable levels including habitable attics and basements not provided with an egress door in accordance with Section R311.2 shall be by a ramp in accordance with Section R311.8 or a stairway in accordance with Section R311.7.
A flight of stairs shall not have a vertical rise greater than 12 feet (3658 mm) between floor levels or landings. Exception: Spiral stairways used as a means of egress from technical production areas ...