What is the recommended PSI for a fog nozzle on a handline?

The recommended PSI for a fog nozzle on a handline is typically set at 75 PSI. This pressure setting strikes a balance between adequate reach and the ability to produce fine water droplets, which enhance cooling and extinguishment effectiveness. At this pressure, the nozzle can effectively create the desired fog pattern, allowing for better penetration of the fire and reducing the potential for steam burns to firefighters or bystanders. Additionally, operating at this PSI helps to maintain a manageable flow rate that is conducive to the physical capabilities of a firefighter using a handline.

Higher pressures can lead to less control and increased nozzle reaction, making it more challenging for firefighters to maneuver. Conversely, pressures that are too low might not provide enough reach or sufficient coverage needed to combat a fire effectively. Therefore, 75 PSI is considered the optimal setting to maximize both the effectiveness of the fog stream and the safety of the personnel using it.