Dry Powder Extinguisher.(Standard) |
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Best For |
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Liquids such as grease, fats, oil, paint, petrol etc but not on domestic chip or fat pan fires. |
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Danger |
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Safe on live electrical equipment, although does not penetrate the spaces in equipment easily and the fire may re-ignite. This type of extinguisher does not cool the fire very well and care should be taken that the fire does not re-ignite. Do not use on domestic chip or fat pan fires. |
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How to Use |
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Point the jet or discharge horn at the base of the flames and, with a rapid sweeping motion, drive the fire towards the far edge until all the flames are out. If the extinguisher has a shut-off control wait until the air clears and if you can still see the flames, attack the fire again. |
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How it Works |
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Similarly to almost all extinguishing agents the powders acts as a thermal ballast making the flames too cool for the chemical reactions to continue. Some powders also provide a minor chemical inhibition, although this effect is relatively weak. These powders thus provide rapid knockdown of flame fronts, but may not keep the fire suppressed.
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