What causes rekindle after extinguishment and how is it prevented during overhaul?

• A. Water temperature.
• B. Wind gusts.
• C. Hidden pockets of heat reignited by air; thorough overhaul with TIC checks and removal of hot spots.
• D. Equipment failure.

Answer: (C)

Rekindle after extinguishment comes from hidden pockets of heat that stay behind in walls, ceilings, debris, or voids. These hot spots can be reignited when air flows through the structure during overhaul, supplying the oxygen they need to flare up again. The best way to prevent this is a thorough overhaul that uses a thermal imaging camera to detect those concealed hot spots, followed by removing or cooling them until everything is safe and no embers remain. Controlling ventilation and verifying coolness are also important to stop any remaining heat from reigniting. Water temperature, wind gusts, or equipment failure aren’t the main factors here; the focus is on finding and eliminating hidden heat sources with proper TIC checks.