1029.13.2.1 Dual Access
For rows of seating served by aisles or doorways at both ends, there shall be not more than 100 seats per row. The minimum clear width of 12 inches (305 mm) between rows shall be increased by 0.3 inch (7.6 mm) for every additional seat beyond 14 seats where seats have backrests or beyond 21 where seats are without backrests. The minimum clear width is not required to exceed 22 inches (559 mm).
|TOTAL NUMBER OF SEATS IN
THE SMOKE-PROTECTED OR
OPEN-AIR ASSEMBLY SEATING
|MAXIMUM NUMBER OF SEATS PER ROW PERMITTED TO
HAVE A MINIMUM 12-INCH CLEAR WIDTH AISLE ACCESSWAY
|Aisle or doorway at both ends of row||Aisle or doorway at one end of row only|
|Seats with backrests||Seats without backrests||Seats with backrests||Seats without backrests|
|Less than 4,000||14||21||7||10|
|22,000 and greater||21||28||11||14|
For SI: 1 inch = 25.4 mm.