When dealing with a fire in structural void spaces, what should be in place before using positive-pressure ventilation?

Before using positive-pressure ventilation (PPV) in scenarios involving fires in structural void spaces, having access to those spaces is essential. This access allows firefighters to confirm that they can effectively ventilate the area and assess the situation before introducing air pressure.

Access to the void spaces is critical for ensuring that the fire can be extinguished effectively. It allows teams to determine the location and extent of the fire, as well as assess potential hazards. With access established, firefighters can create a direct path for smoke and heat to escape and introduce fresh air, which can help suppress the fire by diluting the concentration of smoke and flammable gases.

In addition, gaining access to the areas needing ventilation enables firefighters to monitor for any potential backdraft situations or other hazards that could arise during the ventilation process. It ensures that the use of PPV is safe and effective, maximizing the control of the fire and minimizing potential risks to the crews involved.

Other options, while potentially useful in various firefighting scenarios, do not address the primary need for access in the context of using positive-pressure ventilation specifically for void spaces.