Basic Firefighter Written Practice Exam

What is the main goal of using negative-pressure ventilation during firefighting?

1. To push smoke away from the exit

2. To draw smoke out of the structure

3. To cool the environment

4. To enhance fire growth

The correct answer is: To draw smoke out of the structure

The main goal of using negative-pressure ventilation during firefighting is to draw smoke out of the structure. This technique involves creating a pressure differential by using fans to exhaust the smoke and heat from the building, thereby improving visibility and conditions for both firefighters and any potential victims inside. By effectively removing smoke, negative-pressure ventilation can help to reduce the risk of backdrafts and flashovers, making it safer for firefighters to enter and perform their duties. Furthermore, this method assists in clearing toxic gases and improving air quality, which are crucial for a successful firefighting operation. The other options suggest outcomes that do not align with the primary purpose of negative-pressure ventilation: pushing smoke away from the exit does not actually remove it from the environment, cooling the environment is not a direct effect of this technique, and enhancing fire growth is contrary to the goal of extinguishing the fire.