Where should post-fire symbols be displayed?

• A. Exterior entrances only
• B. Interior entrances only
• C. Exterior and interior entrances to small rooms in buildings licensed for storing explosives
• D. On fences around the site

Answer: (C)

Signs indicating post-fire hazards should be visible at all access points to the explosive storage areas, so responders can quickly locate and approach the hazardous space from either outside or inside the building. In buildings licensed for storing explosives, those storage areas are typically small rooms with controlled doors. Placing symbols on both exterior and interior entrances ensures that, whether firefighters are approaching from outside or entering through interior doors, they can instantly identify the presence of explosives and take appropriate precautions. Displaying signs only at exterior entrances misses internal access, and signs only at interior entrances miss exterior access, which could delay recognition of the hazard. Fences around the site don’t reliably indicate the exact location of the storage rooms or reach responders who need to know where the hazard lies, so the most effective practice is to mark both exterior and interior entrances to those small rooms.