The type of fog nozzle designed to flow a specific amount of water at a specific nozzle discharge pressure on all stream patterns is known as a(n):

The type of fog nozzle designed to deliver a specific flow rate of water at a predetermined discharge pressure, regardless of the stream pattern selected, is termed a constant or fixed gallonage nozzle. This type of nozzle is engineered to maintain consistent flow characteristics, ensuring that firefighters can expect a reliable amount of water delivery without fluctuations based on the selected spray pattern.

This consistent performance is crucial in firefighting situations where precise water management is necessary for effective suppression efforts. By utilizing a constant or fixed gallonage nozzle, firefighters can effectively coordinate their tactics, knowing exactly how much water will be flowing at the specified pressure, which can significantly enhance operational efficiency and safety.

While other nozzle types, like adjustable and variable gallonage nozzles, allow for changes in flow and patterns based on user preference and incident requirements, they do not provide the same fixed output as the constant or fixed gallonage nozzle. The full-jet nozzle, too, serves specific purposes but is focused on delivering a solid stream rather than maintaining constant flow rates across different patterns.