During overhaul, why is it important to check hidden spaces for embers?

• A. To prevent rekindling and detect concealed fires.
• B. To increase oxygen.
• C. To open walls for venting.
• D. To install new wiring.

Answer: (D)

During overhaul, the key reason to check hidden spaces for embers is to prevent rekindling and uncover any concealed fires that survived the main extinguishment. Embers can smolder quietly in cavities, behind walls, in insulation, ceilings, voids, crawlspaces, or behind appliances. Even after the visible flames are out, these hot pockets can reignite once air, heat, or new fuel is introduced. Thoroughly inspecting these hidden areas helps identify and extinguish or cool any remaining embers, ensuring the fire is fully controlled and reducing the risk of a renewed fire later.

This step isn’t about increasing oxygen, opening walls for venting, or installing new wiring. Those tasks serve other purposes, whereas the ember check specifically targets completeness of extinguishment and safety by removing hidden fire threats.