When is it appropriate to close doors to rooms during Positive Pressure Ventilation?

Closing doors to rooms during Positive Pressure Ventilation (PPV) is appropriate to maintain the integrity of the ventilation process. When PPV is applied, the goal is to create a pressure differential that pushes smoke and heat from the structure towards the exit points. By closing doors to rooms that are not being ventilated, it helps to direct the airflow effectively, ensuring that the smoke and heat are pushed out of the openings created by the PPV. This method improves the overall efficiency of the ventilation and maximizes safety for any occupants still inside.

Keeping doors closed in unaffected areas reduces the chance of smoke spread and helps to improve visibility for firefighters working in the structure. It is crucial to focus the airflow where it is most needed, which is achieved by managing the surrounding doors effectively during PPV operations. This technique is fundamental to maintaining operational control and ensuring that firefighters can navigate the environment safely and efficiently.

In contrast, seeking ventilation, preparing for an evacuation, or closing doors universally at all times could lead to unnecessary complications or impede effective ventilation. Each of these scenarios does not align with the specific strategy of maximizing PPV effectiveness as closing doors does.