WATER FOG IN WESTERN EUROPE
A 1993 article by Paul T. Grimwood, a firefighter in the London Fire Brigade, discusses a new method of using water fog for interior fire attack.1 This method, developed in Sweden and termed "offensive fog application," is designed to protect the nozzle team from the dangers of rollover and flashover without the excessive steam production characteristic of the combination method of attack. In his article, Grimwood describes techniques whereby low-volume fog streams are directed into the overhead gas layers using very short-duration bursts or "pulses" of water, intended to cool the combustion gases and reduce internal pressure in the fire area. This action reportedly narrows the flammable range of the gases and reduces the potential for flash-
over without "over-drenching the gas layers" and creating unwanted steam.2
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