Which method uses openings at the same level as the fire for ventilation?

Horizontal ventilation is a crucial firefighting technique that involves the use of openings at the same level as the fire to effectively allow smoke, heat, and fire gases to exit a structure while drawing in fresh air. This method is particularly effective because it facilitates the movement of air in a horizontal direction across the level of the fire, enabling better control of smoke and improving visibility for firefighters working in the affected area.

By creating an opening on the same level, this technique prevents the heat and toxic gases from accumulating, which can happen when ventilation is performed from above. It also aids in reducing the risk of backdrafts and flashovers, as the controlled removal of these hazardous gases helps to manage the fire's behavior effectively.

This method is typically employed in situations where fires are located on the same floor level as the openings being utilized, making it a preferred choice in many firefighting scenarios.