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A variable-stream fog nozzle can be used to create a straight stream, but a straight tip cannot develop a fog pattern. Fog nozzles have been developed to create droplets of specific sizes to maximize the heat-absorption qualities of water; they should be utilized in most instances to help us effectively and efficiently put the fire out. Those of us who have had training in flashover simulators are well aware of the capabilities of a fog nozzle to delay or prevent flashover by directing a narrow pattern into the heated overhead. Once a firefighter has entered a fire building, it is too late to change nozzles.
I have not even attempted to address the latest versions of the fog nozzle, such as the constant-gallonage type or the even newer low-pressure fog nozzles. But whichever nozzle(s) a department utilizes, training is absolutely necessary to accomplish the desired results without endangering our personnel or anyone who may be in the building on fire.