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408.3.3 Guard tower doors.
A hatch or trap door not less than 16 square feet (1.49 m
2
) in area through the floor and having 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 1011.10 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 1011.15.
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, be located not less than 50 feet (15 240 mm) from the building and have an area of not less than 15 square feet (1.4 m
2
) 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 Interior exit stairway and ramp construction.
One interior exit stairway or ramp in each building shall be permitted to have glazing installed in doors and interior walls at each landing level providing access to the interior exit stairway or ramp, provided that the following conditions are met:
1. The interior exit stairway or ramp shall not serve more than four floor levels.
2. Exit doors shall be not less than 3/4 hour fire door assemblies complying with Section 716.5.
3. The total area of glazing at each floor level shall not exceed 5,000 square inches (3.2 m
2
) and individual panels of glazing shall not exceed 1,296 square inches (0.84 m
2
).
4. The glazing shall be protected on both sides by an automatic sprinkler system. The sprinkler system shall be designed to wet completely the entire surface of any glazing affected by fire when actuated.
5. The glazing shall be in a gasketed frame and installed in such a manner that the framing system will deflect without breaking (loading) the glass before the sprinkler system operates.
6. Obstructions, such as curtain rods, drapery traverse rods, curtains, drapes or similar materials shall not be installed between the automatic sprinklers and the glazing.
(Am. L.L. 2023/077, 6/11/2023, eff. 6/11/2023)
Editor's note: For related unconsolidated provisions, see Appendix A at L.L. 2023/077.
408.4 Locks.
Egress doors are permitted to be locked in accordance with the applicable use condition. Doors from a refuge area to the outside are permitted to be locked with a key in lieu of locking methods described in Section 408.4.1. The keys to unlock the exterior doors shall be available at all times and the locks shall be operable from both sides of the door.
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