What type of ventilation pushes smoke and heat out of a structure?

Positive Pressure Ventilation (PPV) is a technique specifically designed to push smoke and heat out of a structure. This method involves using powered fans to create a higher air pressure inside the building compared to the outside atmosphere. By introducing fresh air and creating positive pressure within the space, smoke and superheated gases are effectively forced out of openings, reducing the heat and improving visibility for firefighters.

The technique is particularly useful in situations where it is essential to quickly clear smoke to facilitate safer entry for firefighting operations or to help protect the occupants within. This method also helps to reduce the likelihood of flashover by lowering the temperature of the smoke layer. Therefore, the focus on pushing air out and maintaining a clear environment for firefighting makes Positive Pressure Ventilation an effective strategy for smoke and heat management.