Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 4 - Special Detailed Requirements Based on Use and Occupancy
Section 408 - GROUP I-3
Subsection 408.3 - Means of egress
Current through Register 1531, September 27, 2024
Except as modified or as provided for in this section, the provisions of Chapter 10 shall apply.
408.3.1 Door width. Doors to resident sleeping units shall have a clear width of not less than 28 inches (711 mm).
408.3.2 Sliding doors. Where doors in a means of egress are of the horizontal-sliding type, the force to slide the door to its fully open position shall not exceed 50 pounds (220 N) with a perpendicular force against the door of 50 pounds (220 N).
408.3.3 Guard tower doors. A hatch or trap door not less than 16 square feet (610 m2) in area through the floor and having minimum dimensions of not less than 2 feet (610 mm) in any direction shall be permitted to be used as a portion of the means of egress from guard towers.
408.3.4 Spiral stairways. Spiral stairways that conform to the requirements of Section 1009.9 are permitted for access to and between staff locations.
408.3.5 Ship ladders. Ship ladders shall be permitted for egress from control rooms or elevated facility observation rooms in accordance with Section 1009.11.
408.3.6 Exit discharge. Exits are permitted to discharge into a fenced or walled courtyard. Enclosed yards or courts shall be of a size to accommodate all occupants, a minimum of 50 feet (15 240 mm) from the building with a net area of 15 square feet (1.4 m2) per person.
408.3.7 Sallyports. A sallyport shall be permitted in a means of egress where there are provisions for continuous and unobstructed passage through the sallyport during an emergency egress condition.
408.3.8 Exit enclosures. One of the required exit enclosures in each building shall be permitted to have glazing installed in doors and interior walls at each landing level providing access to the enclosure, provided that the following conditions are met: