Section 1104 Means of Egress for Existing Buildings
Exit signs shall be internally or externally illuminated. The face of an exit sign illuminated from an external source shall have an intensity of not less than 5 foot-candles (54 lux). Internally illuminated signs shall provide equivalent luminance and be listed for the purpose.
Exception: Approved self-luminous signs that provide evenly illuminated letters shall have a minimum luminance of 0.06 foot-lamberts (0.21 cd/m2).
Where means of egress illumination is provided, the power supply for means of egress illumination shall normally be provided by the premises' electrical supply. In the event of power supply failure, illumination shall be automatically provided from an emergency system for the following occupancies where such occupancies require two or more means of egress:
- Group B buildings three or more stories in height, buildings with 100 or more occupants above or below a level of exit discharge serving the occupants or buildings with 1,000 or more total occupants.
- Group E in interior exit access and exit stairways and ramps, corridors, windowless areas with student occupancy, shops and laboratories.
- Group I.
Guards shall form a protective barrier not less than 42 inches (1067 mm) high.
Open guards shall have balusters or ornamental patterns such that a 6-inch-diameter (152 mm) sphere cannot pass through any opening up to a height of 34 inches (864 mm).
- At elevated walking surfaces for access to, and use of, electrical, mechanical or plumbing systems or equipment, guards shall have balusters or be of solid materials such that a sphere with a diameter of 21 inches (533 mm) cannot pass through any opening.
- In occupancies in Group I-3, F, H or S, the clear distance between intermediate rails measured at right angles to the rails shall not exceed 21 inches (533 mm).
- Approved existing open guards.
The required capacity of each door opening shall be sufficient for the occupant load thereof and shall provide a minimum clear opening width of 28 inches (711 mm). Where this section requires a minimum clear opening width of 28 inches (711 mm) and a door opening includes two door leaves without a mullion, one leaf shall provide a clear opening width of 28 inches (711 mm). The minimum clear opening height of doorways shall be 80 inches (2032 mm).
- The minimum and maximum width shall not apply to door openings that are not part of the required means of egress in occupancies in Group R-2 and R-3 units that are not required to be an Accessible Type A unit or Type B unit.
- Door openings to storage closets less than 10 square feet (0.93 m2) in area shall not be limited by the minimum clear opening width.
- The width of door leaves in revolving doors that comply with Section 1010.1.4.1 shall not be limited.
- The maximum width of door leaves in power-operated doors that comply with Section 1010.1.4.2 shall not be limited.
- Door openings within a dwelling unit shall have a minimum clear opening height of 78 inches (1981 mm).
- In dwelling and sleeping units that are not required to be Accessible units, Type A units or Type B units, exterior door openings, other than the required exit door, shall have a minimum clear opening height of 76 inches (1930 mm).
- Exit access doors serving a room not larger than 70 square feet (6.5 m2) shall have a minimum door leaf width of 24 inches (610 mm).
- The minimum clear opening width shall not apply to doors for nonaccessible showers or sauna compartments.
- The minimum clear opening width shall not apply to the doors for nonaccessible toilet stalls.
- Door closers and door stops shall be permitted to be 78 inches (1980 mm) minimum above the floor.
Revolving doors shall comply with the following:
- A revolving door shall not be located within 10 feet (3048 mm) of the foot or top of stairways or escalators. A dispersal area shall be provided between the stairways or escalators and the revolving doors.
- The revolutions per minute for a revolving door shall not exceed those shown in Table 1104.9.
- Each revolving door shall have a conforming side-hinged swinging door in the same wall as the revolving door and within 10 feet (3048 mm).
- A revolving door is permitted to be used without an adjacent swinging door for street-floor elevator lobbies provided that a stairway, escalator or door from other parts of the building does not discharge through the lobby and the lobby does not have any occupancy or use other than as a means of travel between elevators and a street.
- Existing revolving doors where the number of revolving doors does not exceed the number of swinging doors within 20 feet (6096 mm).
REVOLVING DOOR SPEEDS
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
- Revolving doors shall not be given credit for more than 50 percent of the required egress capacity.
- Each revolving door shall be credited with not more than a 50-person capacity.
- Revolving doors shall be capable of being collapsed when a force of not more than 130 pounds (578 N) is applied within 3 inches (76 mm) of the outer edge of a wing.
Exception: For fire escape stairways serving 10 or fewer occupants, an approved fire escape ladder is allowed to serve as the termination.