What type of ventilation utilizes fog or broken-pattern fire streams?

Hydraulic ventilation refers specifically to the use of water streams to remove smoke and heat from a structure during a fire. By deploying fog or broken-pattern fire streams, this method allows firefighters to create a negative pressure zone within the building, which effectively draws out the smoke and hot gases. The fine droplets in the fog stream increase the surface area for heat absorption, allowing for efficient cooling and smoke removal.

While negative pressure ventilation and positive pressure ventilation involve the movement of air into or out of a structure, they do not utilize water streams as the primary method for clearing smoke. Natural ventilation relies on external forces, such as wind or temperature differences, to promote airflow without mechanical assistance or water application. Thus, hydraulic ventilation stands out as the correct answer due to its distinct use of water to enhance smoke and heat removal.