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The Cutting Extinguisher technique consists of a mixture of water and cutting agent (abrasive) being ejected through a special nozzle at high pressure (>250 bar) to cut through all known building and construction materials.

The method facilitates combating fire and fire gases from the outside of the fire location. The high pressure of the water results in very high velocity and dispersal of the water into droplets.

Once a roof, wall, door, casing, car body, hull, silo wall, or similar construction, has been penetrated the cutting medium is shut off and only water is applied through the thumbnail-size hole in the form of a very finely distributed mist.

As the penetration hole is so small no oxygen is admitted to the fire area, which significantly boosts the firefighting effect. The smaller the opening to the fire area, the more effectively the temperature will be reduced, as the mass of gas will be more easily made inert if the area is completely sealed. The water vapour stays longer in the area and the temperature is reduced accordingly.

Practical action with the Cutting Extinguisher also demonstrates that the higher the temperature in the fire area, the better the cooling and extinguishing effect will be.

Even if fire goes through the roof construction during a fire in an attic or similar area the Cutting Extinguisher is an efficient firefighting tool.

When intensive water droplets enter the fire area a highly effective extinguishing process begins, which can be said to consist of four different parts:

• cooling of the gas in the area around the fire

• cooling of fuel and potential pockets of fire

• reduction of oxygen concentration

• absorption of heat radiation

In general it applies that cooling, due to evaporation of water, is faster in relation to a greater available surface area (many small drops provide a greater effective surface area of water). The greater the velocity of the droplets, the faster the cooling of the fire gases.

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