What method of ventilation creates openings at the same level as the fire?

Horizontal ventilation is the method that involves creating openings at the same level as the fire. This technique is primarily used to remove heat, smoke, and toxic gases from the structure while bringing fresh air in from the outside. By opening windows or doors at the same level as the fire, firefighters can create a more direct path for the smoke and heat to escape, effectively clearing the environment to improve visibility and advance towards the fire more safely.

The effectiveness of horizontal ventilation relies on the natural flow of smoke and heat, which rises and typically travels horizontally before escaping. This method is particularly advantageous when attempting to control the spread of fire and minimizing the risk of backdraft conditions.