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 that is designed to flow a specific amount of water at a particular nozzle discharge pressure across all stream patterns is indeed known as a constant or fixed gallonage flow nozzle. This type of nozzle is engineered to deliver a steady, predetermined flow rate, regardless of the selected pattern—be it straight stream or fog.

This consistency in performance is crucial for effective firefighting because it ensures that firefighters have reliable control over water delivery during operations, allowing them to make tactical decisions based on a known quantity of water being used. The fixed gallonage flow nozzle typically operates at a designated pressure, creating a linearly predictable output, which can be essential for maintaining effective fire suppression.

In contrast, other nozzle types, such as variable flow nozzles and automatic flow nozzles, do not function under the same principles. Variable flow nozzles allow the operator to adjust the flow rate based on the needs of the situation, which can introduce variability depending on the pattern or pressure used. Automatic flow nozzles adjust the flow rate automatically based on changes in pressure, which can also result in an output that varies depending on the conditions. Therefore, the constant or fixed gallonage flow nozzle stands out by providing a reliable and consistent flow rate for