North Carolina Fireground Operations 8 Practice Test

The ability to choose among several flow settings is built into adjustable-gallonage fog nozzles. This design includes a control that lets you select preset flow rates (gallonage) to tailor water output to the fire situation, allowing a balance between reach, heating, and water damage. By twisting or adjusting the nozzle, you can switch between different GPM settings as needed, rather than being stuck with a single fixed flow. Other nozzle types pictured don’t provide this quick, selectable flow capability: piercing nozzles are for ventilation or penetration tasks, straight bore nozzles have a fixed flow based on the orifice with no onboard setting to change it, and master stream designs are focused on large-volume streams and aren’t defined by multiple selectable flow settings in the same way.