To disperse hot gases inside a structure fire, responders should:

Ventilating the fire is crucial for dispersing hot gases within a structure because it helps to create a flow path for the heat and smoke created by the fire. When responders ventilate, they open windows, doors, or use specialized tools to allow air to circulate, which reduces the temperature and pressure buildup inside the structure. This action not only helps to improve visibility for firefighters entering the scene but also reduces the risk of flashover—a rapid spread of fire when the gases ignite.

In contrast, applying an extinguishing agent directly targets the flames and may not address the buildup of hot gases effectively. Knocking down the fire involves applying water or foam to reduce the fire's intensity but does not facilitate the immediate removal of hot gases. Spreading the fire would negate efforts to protect the structure and occupants and is counterproductive to the goal of ensuring safety and effective fire suppression. Ventilation, therefore, plays a vital role in controlling the environment for both firefighters and any trapped occupants.