What height must walls be to be permissible for a mezzanine open to the room it is located in, assuming an occupant load of 20?

For a mezzanine that is open to the room it is located in, proper wall height is specified to maintain safety and accessibility while allowing the area to function correctly within the building code requirements. In this situation, the correct answer indicates that the walls must be no more than 42 inches high.

This height limit is significant as it helps to ensure visibility and open sightlines, allowing for a better experience within the space. It also provides adequate safety for occupants, particularly when considering an occupant load of 20. A wall height of more than 42 inches could obstruct sightlines or create a potential barrier for evacuation in case of emergencies. This regulation strikes a balance between safety and functionality for open mezzanines, aligning with safety codes that are often emphasized in commercial building inspections.