What is the PSI for the Master Steam nozzle when using fog?

The Master Stream nozzle typically operates within a specific pressure range to ensure proper water flow and effectiveness when deploying fog streams for fire suppression. In this context, the correct pressure setting for the Master Stream nozzle when utilizing fog is 75 psi.

Using fog as a method of fire control is beneficial because it provides a broader coverage area with the ability to create a vapor barrier that can help in cooling and suppressing flames. The specified 75 psi allows the nozzle to achieve an adequate flow rate and reach while maintaining a fine spray pattern necessary for effective thermal protection and extinguishing capability.

Setting the pressure too high can lead to an undesirable stream pattern that might hinder effective firefighting, whereas a lower pressure may not produce enough reach or volume to combat the fire effectively. Therefore, the 75 psi setting is crucial for balancing performance and safety in fireground operations.