How long should an exterior fire stream be directed if possible?

Directing an exterior fire stream for about 15 seconds is based on established firefighting practices that allow for effective suppression. This duration is generally considered sufficient to adequately penetrate the fire area and begin cooling the environment, which helps to mitigate the risk of fire extension or spread.

The time period of 15 seconds strikes a balance. It is long enough to ensure that the application of water reaches the targeted area, allowing for initial cooling and potential steam conversion. This process aids in reducing temperatures and smoke production, making the subsequent firefighting efforts safer and more effective.

While shorter durations might not provide enough time for significant impact or may allow the fire to re-establish, longer durations could waste water resources or increase the risk of creating steam or thermal layering without sufficient benefit. Hence, directing an exterior fire stream for 15 seconds is a practical and strategic approach in firefighting operations.