When is hydraulic ventilation typically employed?

Hydraulic ventilation is a technique used to clear smoke and heat from a structure after the fire has been extinguished. It involves using a nozzle or hose to create a high-pressure water spray directed towards the opening of a window or door. This action helps to push out the smoke and hot air that can linger even after the flames are out, thereby improving visibility and reducing the risk of re-ignition.

Using hydraulic ventilation after the fire is extinguished is essential for ensuring that any remaining toxic gases and smoke are removed from the environment, making it safer for firefighters and any potential occupants of the building. This method effectively utilizes the momentum of the water spray to enhance the ventilatory effect, thereby making it a valuable practice in post-fire operations.

Other situations, such as during active firefighting or before the fire starts, are not appropriate for this technique as it is specifically designed for use once the fire has been contained and extinguished. In the context of vehicle fires, hydraulic ventilation is not the primary focus as the approach may differ based on the nature and location of the fire.