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1028.17 Places of Assembly With an Occupant Load of Less Than 12 Square Feet Per Person
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For the purposes of Section 1028.17, exit openings shall be classified as follows:
- Class 1—Exit openings that are used for normal entry to the assembly space, and that open directly to a safe area or to an open exterior space.
- Class 2—Exit openings that are not used for normal entry to the assembly space, and that open directly to a safe area or to an open exterior space.
- Class 3—Exit openings that open from the assembly space into corridors, exit passageways or vertical exits.
The required exit capacity from assembly spaces in which the net floor area, exclusive of stage area, is less than 12 square feet (1.11 m2) per person shall be distributed so that exit openings of each class are provided to comply with the following requirements:
- For assembly spaces in which the mean floor level is not more than 15 feet (4572 mm) above or below the adjoining grade elevation, the exit capacity shall be distributed as follows:
- Class 1—not less than 40 percent.
- Class 2—not more than 60 percent.
- Class 3—not more than 40 percent.
- For assembly spaces in which the mean floor level is more than 15 feet (4572 mm) above or below the adjoining grade elevation, the exit capacity shall be distributed as follows:
- Class 1—not less than 60 percent.
- Class 3—not more than 40 percent.
The capacity of exits from safe areas shall be provided for all occupants of the safe area. Safe areas shall comply with the following requirements:
- When provided to serve Class 1 or 2 exit openings, safe areas shall be separated from assembly spaces by fire barriers constructed in accordance with Section 707 or horizontal assemblies constructed in accordance with Section 712, or both, each having a 2 hour fire-resistance rating. Such safe areas shall serve as transition areas in the line and direction of exit travel. They shall serve for normal entry to the assembly space and may be used as corridors, lobbies or lounges.
- No room or space classified in Occupancy Group H, S-1, F-1 or F-2 shall open upon a safe area.
- Safe areas shall be at a level not more than 6 feet (1829 mm) above or below the level at which egress is made from the assembly space.
- Ventilating systems for safe areas shall not be connected to systems serving any other spaces, unless separated from such systems by fire/smoke dampers actuated by smoke detectors.
- Collecting safe areas. Places of assembly having more than one assembly space may have a collecting safe area that receives the occupant load discharged into it by other safe areas. Collecting safe areas shall be located within 6 feet (1829 mm) above or below the assembly space nearest to grade.
- Occupant load. The occupant load of a safe area shall be the aggregate occupant load of all exit openings discharging directly into it. The occupant load of a collecting safe area shall be the aggregate occupant load of all exit openings discharging directly into it, plus 50 percent of the occupant load of other safe areas discharging into it.
- Dimensions. The clear unobstructed floor area of each safe area shall be sufficient to accommodate the total occupant load of the safe area on the basis of 3 square feet (0.28 m2) per person, not including space occupied by furniture or equipment. The minimum dimension of such unobstructed space shall be 8 feet (2438 mm). The width of the unobstructed space shall be measured at right angles to the direction of travel to an exit and shall not be less than required for the occupant load. The height of safe areas shall be at least 8 feet (2438 mm) at all points.
- Safe areas near grade. When a safe area provides egress to an open exterior space, either directly or through a vestibule, the safe area need not provide the floor area required by this section when the level of discharge from the safe area to the open exterior space is not more than 4 feet (1219 mm) above or below the grade of the open exterior space.
In addition to requirements of Section 1006, safe areas shall be artificially lighted by electrical means at all times during occupancy of a place of assembly so as to provide illumination of at least 5 foot-candles (54 lux) at the level of the floor and on the surface of all stairs, steps, ramps, and escalators within the safe area.
The following provisions shall apply when an open exterior space is used as an exit discharge:
- Capacity. Open exterior spaces shall be adequate in width and area to accommodate the accumulated occupant load of all exits discharging into them on the basis of 2 square feet (0.19 m2) per person.
- Minimum dimensions. The minimum dimension of open exterior spaces shall be 20 feet (6096 mm), except that when the principal entrance to the place of assembly is from an open exterior space, the minimum dimension of this space shall be 30 feet (9144 mm). No open exterior space shall have less than 400 square feet (37 m2) of floor area, and floor area shall be measured exclusive of the following:
- The area immediately outside any exit door from the place of assembly for a distance perpendicular to the exit doors of 10 feet (3048 mm) for the full width of the exit opening.
- The area of steps, platforms, stairs, or ramps within or leading to or from the space.
- The area of obstructions such as shrubs, trees, fixed furniture, signs, sculptures, pools, and similar obstructions to occupancy or exit travel.
- Above or below grade. When an open exterior space is more than 15 feet (4572 mm) above or below the grade of the street or public space to which it discharges, its required area shall be increased by one-third.
- Egress from open exterior spaces. Exterior exit passageways, ramps, or steps leading from open exterior spaces shall be not less in width than required for the occupant load of all exits discharging into the open exterior space. The width of such exit passageways shall be based on the capacities listed in Section 1005.1, but in no case less than 10 feet (3048 mm).
- Open exterior spaces. Yards or courts which serve as open exterior spaces shall be artificially lighted by electrical means at all times between sunset and sunrise during occupancy of a place of assembly so as to provide illumination of at least 5 foot-candles (54 lux) at the level of the floor over at least the required area.