What does negative pressure ventilation accomplish?

Negative pressure ventilation is a specific technique used by firefighters to improve conditions within a structure during a fire incident. By drawing out smoke, heat, and harmful gases from the interior, this method helps to make environments safer for both victims and firefighters.

When using negative pressure ventilation, high-powered fans are strategically placed at entrances or exit points to create a difference in pressure. This process effectively pulls air from inside the building to the outside, allowing smoke and toxic fumes to escape. As a result, visibility is improved, and breathable air is provided, making it safer for fire crews to operate within the affected area.

This is particularly important in fire situations where smoke accumulation can obscure visibility and create hazardous conditions. By removing the smoke, the firefighters not only enhance their operational efficiency but also protect occupants who might still be inside.

While other options might suggest useful aspects related to fire management, such as introducing fresh air or controlling smoke entry, the primary and immediate goal of negative pressure ventilation is centered on evacuating smoke and toxic air to create a safer atmosphere for firefighting and rescue operations.