For areas having fixed seating without dividing arms, the occupant load must not be less than the number of seats based on one person for each ____ inches of seating length.

The correct answer indicates that for areas with fixed seating that does not have dividing arms, the calculation for the occupant load is based on not less than one person for each 18 inches of seating length. This standard helps ensure safety and comfort in spaces like theaters, assembly areas, and other venues with fixed seats.

Using this measurement allows for a realistic estimation of how many individuals can safely occupy the space, taking into consideration the physical space allocated per person for safe seating arrangements. Each 18 inches of seating is seen as an appropriate allocation for one person, allowing for adequate space to prevent overcrowding or discomfort.

Understanding this measurement criterion is essential during building inspections, as it directly relates to the building's design compliance with occupancy standards and fire safety codes. Having fixed seats without dividing arms means they are typically closer together, and the correct calculation of occupancy ensures that egress and emergency procedures can be effectively planned and executed.

Other options present different inches per person ratios which do not align with the codes established for occupant load calculations in such settings. The specific figure of 18 inches takes into account various considerations, such as allowing enough room for individuals to move comfortably and minimizing hazards during an emergency evacuation.