What is the basis for occupant load for bleachers and pews?

The basis for calculating occupant load for bleachers and pews is 18 inches per person. This standard measurement is used within fire codes and safety regulations to ensure that each individual has an appropriate amount of space when seated, thereby promoting safety during occupancy, particularly during emergencies. The measurement accounts for the average space required for a person sitting down, considering the unique arrangements and potential crowding scenarios in bleacher and pew settings. Using 18 inches allows for a balance between maximizing seating capacity and maintaining safety standards, thus helping to prevent overcrowding and facilitating evacuation if necessary.