Which practice helps prevent a backdraft during interior entry?

• A. Size-up, controlling openings, and using ventilation before major internal attack
• B. Opening all doors immediately
• C. Ventilating with no planning
• D. Entering with a charged line only

Answer: (A)

Preventing backdraft during interior entry comes from managing the air and the situation before you push into a burning space. First, size-up helps you recognize when a compartment is hot and filled with fuel-rich gases and when conditions could suddenly change if air flow is introduced. Next, controlling openings means not blasting doors or windows wide open all at once; you pace and position openings so air enters in a controlled way rather than rushing in unpredictably. Finally, ventilation before major internal attack gives you a planned, staged path for heat, smoke, and gases to escape while fresh air is brought in safely, reducing the chance of a dangerous ignition once you enter. A charged hose line is important for suppression, but without planned ventilation and deliberate air control, it won’t prevent backdraft. Opening all doors immediately creates an uncontrolled air supply, and ventilating without planning leads to unpredictable and unsafe airflow.