ICC Commercial Building Inspector Practice Test

What is the minimum adequate width of an aisle in assembly occupancies?

1. 36 inches

2. 44 inches

3. 48 inches

4. 60 inches

The correct answer is: 44 inches

In assembly occupancies, the minimum adequate width of an aisle is indeed 44 inches. This measurement is established in building codes to ensure safe and efficient movement of people within spaces that are designed for gatherings, such as theaters, stadiums, or other places where large groups of individuals may congregate. The rationale for having a minimum width of 44 inches is based on safety considerations. Aisles need to accommodate not only the flow of occupants but also emergency egress during an evacuation. Wider aisles facilitate quicker movement, help prevent bottlenecks, and can allow individuals with mobility devices or those carrying items to navigate the space more easily. Lesser widths, such as 36 inches, may not provide sufficient space during peak usage times or emergencies, leading to potential dangers including crowding or difficulty in exiting the space safely. The established width aims to strike a balance between efficient space use and safe evacuation procedures.