What is an important guideline when using positive pressure ventilation (PPV)?

An important guideline when using positive pressure ventilation (PPV) is to ensure an exhaust crew is in place before starting the ventilation process. This is critical because effective ventilation involves not just the introduction of fresh air into the structure but also the removal of smoke, heat, and toxic gases. The exhaust crew will typically be responsible for managing the exhaust openings, which ensures that the air being pushed into the building by the fan has a clear path to exit. This helps create a more efficient ventilation flow, which can improve visibility and conditions within the building and enhance safety for firefighters and any potential occupants.

Having an exhaust crew in place also minimizes the risk of backdrafts and flashovers by maintaining controlled conditions as smoke and gases are removed. It aligns with safe ventilation practices that are essential in fireground operations, where timing and coordination can significantly impact outcomes. By prioritizing the establishment of an exhaust team, firefighters can ensure that PPV is deployed effectively and safely.