Basic Firefighter Written Practice Exam

What is the required ratio of entry and exit openings when ventilating a structure?

1. 2-1

2. 1-2

3. 1-1

4. 3-2

The correct answer is: 1-1

The required ratio of entry and exit openings when ventilating a structure is critical for creating effective ventilation during firefighting operations. The 1-1 ratio indicates that for every entry opening made, there should be a corresponding exit opening of equal size. This balance helps facilitate the movement of smoke and heat out of the structure while allowing fresh air to enter, which is essential for maintaining a safe environment for both firefighters and any occupants still inside. Achieving a 1-1 ratio prevents the buildup of pressure within the structure, which can occur if there is more entry than exit space. Proper ventilation minimizes the chances of backdraft conditions and helps to control the fire more efficiently, allowing for faster and safer operations. It also ensures that the tenable space within the building remains as safe as possible for search and rescue efforts. In the context of firefighting practices, adequate ventilation plays a crucial role in maintaining visibility and temperature control, which are vital for both the safety and effectiveness of firefighting efforts.