What are fog nozzles?

Some articles on fog nozzles, fog nozzle:

Fog Nozzle - Roles
... Fog nozzles play an important part in firefighting tactics due to their versatility ... The wide variety of fog nozzle manufacturers allows them to accommodate different sizes of fire hose- most often attack hand line- and streams and are capable in both fire protection and attack ... With regard to flow rate, it is imperative to be sure that each fog nozzle be able to handle the flow rate of its water supply because the master stream ...

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