A master stream device is defined as capable of delivering water at a minimum rate of:

A master stream device is recognized as a water delivery apparatus that can discharge a significant volume of water, typically used in firefighting operations where large quantities of water are required to combat severe fires. The standard established by the National Fire Protection Association (NFPA) specifies that a master stream must be capable of delivering water at a minimum rate of 1325 liters per minute, which is equivalent to 350 gallons per minute (gpm).

This standard reflects the need for rapid and effective firefighting measures, particularly in large-scale incidents where achieving a high flow rate can make a critical difference in controlling a fire. The designation of a device as a master stream signifies that it can handle this minimum flow rate under typical firefighting scenarios, ensuring both efficiency and safety when deployed in a crisis.

In contrast, the other flow rates listed do not meet the baseline criteria set by the NFPA for master stream devices. Firefighters must be aware of these specifications to ensure they are using appropriate equipment based on the needs of the firefighting operations they encounter.