What term describes preventing the fire from progressing by isolating the source?

• A. Direct attack from compartment access
• B. Indirect attack
• C. Fog attack
• D. Mechanical isolation

Answer: (D)

Isolating the fire’s source by using physical means to cut off what it needs to burn is the essence here. This is mechanical isolation: you shut off fuel lines, disconnect power as safe, and close ventilation or compartment doors/dampers to starve the fire of fuel and oxygen and stop it from spreading. Direct attack involves applying water directly to the flames, indirect attack focuses on cooling or attacking from a protected side, and a fog attack uses a fog pattern to cool and displace heat—none of these specifically describe cutting off the fire’s supply to prevent progression like mechanical isolation does.