What is a potential fire protection risk when large, reorganized floor displays are installed in mercantile occupancies?

• A. Emergency lighting may be blocked by the larger displays.
• B. The fire can spread due to the expanded area.
• C. The original automatic sprinkler discharge patterns are altered.
• D. The movement of displays shifts the location of limited combustible materials.

Answer: (C)

When automatic sprinklers are designed, their discharge patterns assume clear spaces and specific layouts. Introducing large, tall floor displays in mercantile occupancies creates new obstructions at the floor level that can intercept, reflect, or block the sprinkler sprays. This means the water distribution that the system was designed to achieve is no longer guaranteed, leaving areas under-protected or receiving insufficient water exposure during a fire. That alteration to how the water is discharged and spread is the primary fire protection risk created by reorganized floor displays.

Emergency lighting being blocked is a safety concern, but it doesn’t directly address the sprinkler system’s protective performance. Expanding the area or moving combustible materials aren’t as directly tied to the sprinkler discharge pattern as the obstruction and deflection of water is. Therefore, the most correct concept is the alteration of the original sprinkler discharge patterns.