What is NOT usually considered an indication of possible hidden fires during overhaul?

The correct answer is that holes burned through floors are not usually considered an indication of possible hidden fires during overhaul. Holes in the floor are more indicative of direct flame exposure or intense heat that has already penetrated through the flooring material. While such damage is significant, it doesn't necessarily suggest that hidden fires may still be present.

In contrast, smoky odors in the area, discoloration of walls and ceilings, and unusual heat in walls are all strong indicators of potential hidden fires. Smoky odors suggest that combustion materials may still be smoldering nearby. Discoloration in surrounding materials often signals that heat has been applied to the surface, which could mean that something is still burning out of sight. Unusual heat in walls can indicate that fire may have traveled through void spaces or within materials, leading to the potential for rekindling. Thus, while each of these factors merits close attention during overhaul, burned holes specifically do not signify the presence of hidden fires.