What does positive ventilation achieve during a fire situation?

Positive ventilation during a fire situation is primarily focused on forcing fresh air into a space. This influx of air helps to replace the oxygen that is being consumed by the fire, which is crucial for controlling the fire and preventing it from spreading. Introducing additional air can also help to clear smoke and other harmful gases, improving visibility and conditions for firefighting and evacuation.

By forcing air into the affected space, positive ventilation also helps to create a pressure differential that can push smoke and heat out of openings, aiding in the containment and suppression of the fire. This process is essential in managing the fire environment and facilitating effective damage control measures.

The other options do not accurately reflect the purpose and effect of positive ventilation. Simply removing air from the space would not effectively provide the necessary conditions to combat a fire; equalizing air pressure does not directly contribute to fire suppression; and while heat may be displaced, the primary goal remains the intentional introduction of fresh air.