Horizontal guards at raised floor areas should prevent the passage of a sphere with what diameter?

Horizontal guards at raised floor areas are designed to enhance safety by preventing falls and other hazards associated with open spaces. The requirement that these guards should prevent the passage of a sphere with a specific diameter—4 inches in this case—ensures that smaller objects, which could pose a hazard if they fall through, are adequately barred from passing.

Using the 4-inch sphere criterion, the design of the guardrail would be optimized to safeguard against falls or accidents involving not only people but also smaller items that could slip through and lead to injuries or damage below. This specific diameter aligns with safety standards that aim to minimize risks in elevated areas, contributing to a safer environment in places such as balconies, stairways, and areas with machinery. Thus, having a horizontal guard that prevents the passage of a 4-inch sphere reflects a critical safety measure in building design and maintenance practices.