When using an AFFF solution from a portable extinguisher, how far should you stand from the fire?

The optimal distance to stand when using an Aqueous Film Forming Foam (AFFF) solution from a portable extinguisher is 15 feet. This distance is recommended because it allows for effective application of the foam while minimizing risk to the operator. AFFF is designed to smother flames and can be more effective when applied from a close but safe distance, allowing the operator to target the base of the fire where the fuel is located. Standing too far away may reduce the effectiveness of the extinguishing agent, as the foam might not reach the flames efficiently.

Maintaining a distance of around 15 feet strikes a balance between safety and efficacy, ensuring that the operator is not too close to the fire's heat while still being able to adequately apply AFFF to suppress flames.