The downside is the smaller the droplet the less it weighs and therefore the less powerful the cloud of water.ДЄll water extinguishers have a red label.ДЇoam fire extinguishers can be used on Class A and B fires. The smaller the droplet, the larger its surface area in relation to its size, the quicker the droplet evaporates which absorbs the heat energy faster. Water mist, or fog, extinguishers apply water in the form of mist, or fog, the droplets are much smaller than those from the water spray extinguisher.Adding the chemicals to the water means that a smaller extinguisher can produce the same fire rating as a larger, water only, extinguisher. The water loses its natural surface tension meaning that it can soak into the burning materials more effectively. Water extinguishers with additives are water extinguishers with foaming chemicals added.Most water spray fire extinguishers carry a 35 kV dielectric test approval which means they have been tested on a 35,000 Volt electrical source at one meter. Water spray extinguishers use a very fine spray of water droplets, each droplet is surrounded by air which is non-conductive.They should not be used on live electrical equipment. Water jet extinguishers work by spraying a jet of water at the burning materials, cooling them and preventing re-ignition.There are four different types of water extinguishers: water jet, water spray, water with additives and water mist or fog. Water extinguishers are one of the most cost-effective ways to fight Class A fires, those fuelled by solid materials such as paper, wood and textiles.

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Fire extinguisher