How does positive pressure ventilation work?

Positive pressure ventilation works by introducing fresh air into a structure to displace smoke, heat, and toxic products of combustion. This method enhances visibility for firefighters, improves the potential for rescue operations, and can help with the overall management of the fire environment. By pushing air into the space, the pressure increases, allowing for the expulsion of smoke and heated gases toward designated openings, which can improve conditions within the building.

The effectiveness of this technique lies in its ability to control and direct airflow—creating a positive pressure that forces the unwanted smoke and hot gases out of the area. This not only aids in fire suppression but also helps to protect firefighters and civilians by making the environment safer and reducing the likelihood of flashover.

Understanding the mechanics of positive pressure ventilation is crucial for fire suppression tactics, as it can significantly improve the efficiency of dealing with fire situations, rather than relying on methods that may remove smoke through a vacuum effect or simply attempt to cool down the fire area without actively managing the airflow.