What is the main mechanical device used in negative-pressure ventilation?

The main mechanical device used in negative-pressure ventilation is a type of fan. This technique is employed to remove smoke, heat, and toxic gases from a structure by creating a lower pressure zone inside compared to the outside atmosphere. By strategically placing a fan at an opening, the air is pulled out of the building. This not only helps to improve visibility and conditions for firefighters operating within but also enhances the safety of any potential victims by clearing out harmful smoke and gases.

Fans are specifically designed to handle the volume of air needed for effective ventilation. They can be portable and are often lightweight, making them easy to transport and set up in various locations as needed during firefighting operations. The use of a fan in negative-pressure ventilation is vital as it provides the necessary airflow dynamics to facilitate the exchange of air, ultimately aiding in fire suppression and victim rescue efforts.