What type of nozzles typically operate as "handlines only"?

Fog nozzles are designed to operate at lower flow rates and are ideal for use in handline applications. They can produce a fine mist that allows for effective cooling and fire suppression while also providing better control and maneuverability for firefighters. This versatility makes them specifically suitable for situations where a handline (a hose manually operated by firefighters) is necessary.

While smooth bore nozzles are also effective, they tend to be favored for master streams or larger diameter hoses due to their straightforward, powerful water stream. Master stream nozzles are intended for use on apparatus-mounted setups and not suitable for handline operations. Low-volume nozzles may imply less water usage, but they are not inherently designed solely for handline use in the same context as fog nozzles. Thus, fog nozzles are distinctively recognized for their handline functionalities.