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Cellar nozzle is a type of nozzle that is designed for use on fires in confined spaces has a rotating head that distributes water in a circular pattern.
A nozzle is a device used to control the direction or properties of a fluid flow as it exits (or enters) an enclosed chamber or conduit.
A nozzle is often a pipe or tube with changing cross sectional area that can be used to guide or change the flow of a fluid (liquid or gas). Nozzles are widely employed to control the rate of flow, speed, direction, mass, form, and/or pressure of the stream that emerges from them. In a nozzle, fluid velocity increases at the expense of pressure energy. A gas jet, fluid jet, or hydro jet is a nozzle designed to discharge gas or fluid in a coherent stream into a surrounding medium.
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