What is the purpose of positive pressure ventilation?

The purpose of positive pressure ventilation is to introduce clean air into a structure and push out contaminated air. This technique is typically used in firefighting and rescue operations to improve air quality within a building that may be filled with smoke, heat, and toxic gases. By creating a pressure differential, this method allows fresh air to flow into the space while simultaneously forcing the contaminated air out, enhancing visibility, and creating a safer environment for both occupants and responding personnel.

This approach is particularly effective in improving conditions for searching for victims or extinguishing fires, as it helps to reduce the concentration of harmful smoke and gases. Positive pressure ventilation also assists in cooling hot environments, which can significantly improve conditions for firefighters working within a structure.