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Every occupied portion of any building, room or space used for assembly purposes that contains seats, tables, displays, similar fixtures or equipment shall be provided with aisles leading to exits or exit access doorways in accordance with this section.
1030.9.1 Minimum Aisle Width
The minimum clear width for aisles shall comply with one of the following:
  1. Forty-eight inches (1219 mm) for stepped aisles having seating on both sides.
    Exception: Thirty-six inches (914 mm) where the stepped aisles serve less than 50 seats.
  2. Thirty-six inches (914 mm) for stepped aisles having seating on only one side.
    Exception: Twenty-three inches (584 mm) between a stepped aisle handrail and seating where a stepped aisle does not serve more than five rows on one side.
  3. Twenty-three inches (584 mm) between a stepped aisle handrail or guard and seating where the stepped aisle is subdivided by a mid-aisle handrail.
  4. Forty-two inches (1067 mm) for level or ramped aisles having seating on both sides.
    Exceptions:
    1. Thirty-six inches (914 mm) where the aisle serves less than 50 seats.
    2. Thirty inches (762 mm) where the aisle serves less than 15 seats and does not serve as part of an accessible route.
  5. Thirty-six inches (914 mm) for level or ramped aisles having seating on only one side.
    Exception: Thirty inches (762 mm) where the aisle serves fewer than 15 seats and does not serve as part of an accessible route.
1030.9.2 Aisle Catchment Area
The aisle shall provide sufficient capacity for the number of persons accommodated by the catchment area served by the aisle. The catchment area served by an aisle is that portion of the total space served by that section of the aisle. In establishing catchment areas, the assumption shall be made that there is a balanced use of all means of egress, with the number of persons in proportion to egress capacity.
1030.9.3 Converging Aisles
Where aisles converge to form a single path of egress travel, the required capacity of that path shall be not less than the combined required capacity of the converging aisles.
1030.9.4 Uniform Width and Capacity
Those portions of aisles, where egress is possible in either of two directions, shall be uniform in minimum width or required capacity.
1030.9.5 Dead-End Aisles
Each end of an aisle shall be continuous to a cross aisle, foyer, doorway, vomitory, concourse or stairway in accordance with Section 1030.9.7 having access to an exit.
Exceptions:
  1. Dead-end aisles shall be not greater than 20 feet (6096 mm) in length.
  2. Dead-end aisles longer than 16 rows are permitted where seats beyond the 16th row dead-end aisle are not more than 24 seats from another aisle, measured along a row of seats having a minimum clear width of 12 inches (305 mm) plus 0.6 inch (15.2 mm) for each additional seat above seven in the row where seats have backrests or beyond 10 where seats are without backrests in the row.
  3. For smoke-protected or open-air assembly seating, the dead-end aisle length of vertical aisles shall not exceed a distance of 21 rows.
  4. For smoke-protected or open-air assembly seating, a longer dead-end aisle is permitted where seats beyond the 21-row dead-end aisle are not more than 40 seats from another aisle, measured along a row of seats having an aisle accessway with a minimum clear width of 12 inches (305 mm) plus 0.3 inch (7.6 mm) for each additional seat above seven in the row where seats have backrests or beyond 10 where seats are without backrests in the row.
1030.9.6 Aisle Measurement
The clear width for aisles shall be measured to walls, edges of seating and tread edges except for permitted projections.
Exception: The clear width of aisles adjacent to seating at tables shall be permitted to be measured in accordance with Section 1030.13.1.
1030.9.6.1 Assembly Aisle Obstructions
There shall not be obstructions in the minimum width or required capacity of aisles.
Exception: Handrails are permitted to project into the required width of stepped aisles and ramped aisles in accordance with Section 1014.8.
1030.9.7 Stairways Connecting to Stepped Aisles
A stairway that connects a stepped aisle to a cross aisle or concourse shall be permitted to comply with the assembly aisle walking surface requirements of Section 1030.14. Transitions between stairways and stepped aisles shall comply with Section 1030.10.
1030.9.8 Stairways Connecting to Vomitories
A stairway that connects a vomitory to a cross aisle or concourse shall be permitted to comply with the assembly aisle walking surface requirements of Section 1030.14. Transitions between stairways and stepped aisles shall comply with Section 1030.10.

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