What type of water application is recommended when flashover is imminent?

When flashover is imminent, the recommended type of water application is indirect application. This technique involves using water in a way that creates a steam barrier between the fire and combustible materials. The primary goal is to reduce the temperature in the area, which helps to prevent conditions from worsening that could lead to a flashover. By introducing water into the hot gas layer, it will turn into steam and absorb heat, cooling down the environment and allowing firefighters to better navigate the scene and protect lives.

Indirect application is particularly effective in situations where visibility is limited and where direct streams might not reach the seat of the fire or where they could create additional hazards. In contrast, while spray and direct applications may be useful for extinguishing active flames, they can risk causing an explosive mixture of gases under certain conditions when flashover is close. Foam application serves a different purpose, primarily focused on suppressing flammable liquid fires, making indirect water application the optimal choice in scenarios anticipating flashover.