How does positive-pressure ventilation operate?

Positive-pressure ventilation (PPV) is a firefighting technique specifically designed to enhance the efficiency of airflow within a structure during a fire incident. This method involves the use of specialized fans or blowers to force clean air into the building, effectively pressurizing the interior space. As clean air is introduced, it pushes the smoke and heated gases towards designated exit points, facilitating their removal from the structure.

Utilizing positive-pressure ventilation helps in several ways: it improves visibility for firefighters, reduces the temperature inside the structure, and helps to prevent the spread of fire. By creating a pressure differential, it encourages the movement of smoke and contaminants outside, rather than allowing them to be drawn back into the building through negative pressure areas that may result from other factors.

This approach is particularly advantageous in situations where visibility is compromised and the environment within a burning structure can rapidly deteriorate. By focusing on delivering fresh air into the structure, positive-pressure ventilation effectively aids in improving conditions for both occupants who may still be inside and for firefighters working to control the fire.