How can firefighters prevent "re-flash" during overhaul?

Preventing "re-flash" during overhaul is critical in firefighting operations to ensure that all hot spots are fully extinguished and that no embers remain to reignite a fire. Thoroughly checking for hidden fires involves searching through debris, checking walls, ceilings, and other concealed spaces where fire might have spread. This process typically includes using thermal imaging cameras, probing with tools, and performing systematic inspections to ensure that every potential source of rekindling is addressed.

Relying solely on allowing residual heat to escape or increasing ventilation could be insufficient, as these methods do not ensure that hidden fires are completely extinguished. While using additional water applications can help to cool down hot areas, without a thorough inspection for hidden fires, there remains a risk that some ignition sources are left unchecked. Therefore, the most effective strategy in preventing re-flash is to ensure that all possible hot spots and hidden fires are identified and fully extinguished.