A large fire has developed in the HFO centrifuge room accessed by door "E". To combat the fire you should __________. Illustration SF-0013

Correct Answer: Option C — cool adjoining horizontal and vertical surfaces before opening the door to extinguish the fire

Cooling boundaries is a critical firefighting tactic to prevent heat transfer and potential structural failure or flashover. Before entering a compartment, cooling the bulkheads and the door prevents the fire from spreading to adjacent spaces and protects the hose team from thermal radiation when the door is opened.