What is the use of a thermal camera to assess post-fire hotspots?

• A. Identify residual heat and hotspots to prevent rekindle and guide overhaul.
• B. Measure ambient humidity.
• C. Determine occupant locations.
• D. Assess ventilation efficiency.

Answer: (A)

Using a thermal camera after a fire is about identifying residual heat and hotspots that could rekindle. The camera senses infrared energy emitted by all surfaces and translates it into a temperature map, so warm areas show up even through smoke or behind walls. This allows crews to pinpoint where embers or hidden fire may still be smoldering, guiding overhaul work to those spots and ensuring they’re cooled thoroughly before the scene is considered safe. By focusing attention on these heat sources, you reduce the risk of rekindle and verify that the area is truly cold enough to finish the job.

Humidity measurements aren’t provided by a thermal camera, which is why it isn’t used to gauge moisture. Occupant locations are determined through search and rescue and scene assessment, not infrared heat alone. Ventilation efficiency involves airflow assessment and not simply temperature readings, so a thermal camera isn’t the primary tool for that purpose.