Why is a thermal imaging camera valuable during overhaul?

• A. It measures structural load capacity.
• B. It replaces water application.
• C. It determines the age of wood.
• D. It detects hidden heat sources behind walls and ceilings and helps locate rekindled hotspots.

Answer: (D)

Thermal imaging cameras map surface temperatures by detecting infrared energy, revealing heat patterns that aren’t visible to the naked eye. During overhaul after a fire, flames may be out, but hidden hot spots can remain behind walls, ceilings, or void spaces. Finding these rekindled hotspots is crucial to prevent reignition, and the camera lets crews locate them quickly and noninvasively so they can be extinguished or cooled and monitored until everything is truly safe. The other options don’t fit this purpose: structural load capacity isn’t determined by thermal imaging, the camera doesn’t replace actual water application, and it won’t determine the age of wood.