Which type of nozzle is used to fight fires in inaccessible places such as attics and basements?

The type of nozzle specifically designed for fighting fires in inaccessible areas like attics and basements is the cellar nozzle. This nozzle is engineered to be used in situations where direct access to the fire may be difficult or impossible, allowing firefighters to combat the blaze without needing to be in close proximity.

The cellar nozzle often features a design that allows it to penetrate through structural components (like floors and ceilings) or reach into confined spaces to deliver water or foam directly where it’s needed, effectively extinguishing hidden fires or preventing fire spread.

In comparison, other nozzles mentioned have different functionalities or are designed for other firefighting scenarios. For example, a piercing nozzle is used primarily for piercing through roofs or walls to reach the fire inside, but it doesn't provide the versatility needed for confined, low-visibility areas as effectively as a cellar nozzle. Similarly, a water curtain creates a protective barrier of water, which is useful for protecting exposures rather than directly tackling a fire hidden in a restricted area. The plunge nozzle is designed for a different purpose, primarily delivering water in high volumes but, like the water curtain, is less effective for targeting fires in secluded spots compared to the capabilities of a cellar nozzle.