Which method of foam application involves a downward release of foam onto a fire?

The method of foam application that involves a downward release of foam onto a fire is referred to as the drop-down method. This technique is effective because it allows the foam to blanket the fire quickly, effectively smothering it while reducing the risk of reignition. By applying the foam from above, the operator can ensure that it flows down over the fire and the fuel surfaces, maximizing coverage and penetration.

This method is particularly useful in scenarios where fires are located in enclosed spaces or where the fire has spread above the level of the firefighter's reach. The downward application minimizes airborne particles and helps to control the fire's spread by cooling and suffocating it.

Alternative methods, such as roll-on, layering, and direct attack, do not emphasize the downward release of foam, focusing instead on different techniques for managing and extinguishing fires. For example, the roll-on method usually involves applying foam from the side, moving it along the fuel surface, while layering refers to building up layers of foam or water on the fuel. The direct attack method typically involves applying water or foam directly at the base of the fire, which is not conducted in a downward manner.