What is hydraulic ventilation?

• A. Coordinated opening of doors/windows with steam and air movement to remove heat and smoke, improving conditions for search and suppression.
• B. Opening all doors and windows without coordination.
• C. Using fans to push air toward the fire to intensify it.
• D. Sealing doors to prevent smoke movement.

Answer: (A)

Hydraulic ventilation uses a water stream to create steam and pressure differences that move heat and smoke toward a planned exterior exhaust. By coordinating where and when doors and windows are opened, firefighters establish a controlled airflow path: cooler air is drawn in through specific openings while hot gases and smoke are pushed out through others. This combination of steam and directed venting improves interior conditions for search and suppression, reducing heat and increasing visibility. It’s different from simply opening every door or using a fan, both of which can create uncontrolled or counterproductive air movement. Sealing doors to stop smoke movement shuts down the ventilation path entirely, which is not what hydraulic ventilation aims to do.