Where is water directed during hydraulic ventilation?

In hydraulic ventilation, water is directed out a window or door to effectively remove heat, smoke, and gases from a structure. The principles of hydraulic ventilation rely on the creation of a pressure differential, allowing for the escape of superheated smoke and toxic gases. By utilizing the energy of water to push these harmful substances outdoors, firefighters enhance visibility and improve conditions for both themselves and potential victims inside.

When the water is sprayed toward the exit point (like a window or door), it creates a cooling effect and helps to draw the heated air and smoke out, promoting a safer environment. This method is particularly effective in conjunction with other firefighting tactics, as it not only aids in ventilation but also limits the spread of fire by cooling the surrounding air.

Options involving directing water inward or only over the fire seat do not effectively utilize the principles of hydraulic ventilation to clear smoke and gases from the building, thus making them less suitable.