Which nozzle type has the highest flow rate?

The master stream nozzle is designed to deliver a large volume of water at high flow rates, making it ideal for tackling large fires or situations requiring extensive water coverage. Typically used with aerial devices or apparatus equipped for heavy suppression efforts, master stream nozzles can produce flows that significantly exceed those of standard handline or fog nozzles.

In contrast, fog nozzles are designed to create a fine mist or vapor, which offers benefits in cooling and exposure protection but operates at lower flow rates suitable for smaller scale operations. The straight stream nozzle focuses the water in a solid beam, providing effective reach and penetration but still maintains lesser flow than a master stream. Meanwhile, handline nozzles are used for personal firefighting efforts and have flow rates tailored for manageable usage, which are often lower than that of master stream nozzles.

Therefore, the master stream nozzle stands out due to its capacity to deliver the highest flow rates required for large-scale firefighting operations.