What is the term used for drawing in fresh air to a fire, which helps in cooling and reducing flame length?

The term for drawing in fresh air to a fire, which helps in cooling and reducing flame length, is entrainment. In fire dynamics, entrainment refers to the process by which surrounding air enters into the fire area, either through natural convective currents or by engineered means. When fresh, cooler air is introduced, it can effectively lower the temperature of the flames, thus aiding in combustion control. This can lead to a reduction in the overall intensity of the fire and help fire personnel manage the situation more effectively.

On the other hand, extinguishment generally relates to completely putting out a fire or eliminating its fuel sources, while suppression involves controlling or limiting the fire's growth, which may not specifically refer to bringing in fresh air. Containment refers to keeping the fire within a designated area to prevent its spread, which is a different tactical approach. Entrainment focuses explicitly on the influence of airflow on fire behavior, making it a critical concept in fire management and control strategies.