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Water mist fire extinguishers

Guest TonyMans

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The 200 square metres that a 9L water covers is based on its A rating which is 13A. The equation to work out coverage is the floor area in square metres multiplied bt 0.065 (so 200m square equates to 13A).

The 6L Water Mist also has a 13A rating, so it is also capable of covering 200 square metres.

More information can be found in our handy guide here http://www.safelincs.co.uk/fire-extinguisher-buyers-guide/


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You are using the old formula, the latest requires you identify the fire rating which is the rating of fire followed by the class, for a 9 litre water extinguisher it is 13A, but it can vary so you need to check the fire rating. For a 6 litre water mist extinguisher it is 13A so they both have the same capability. 

The minimum quantity of extinguishers with an A rating should be calculated as any storey with a floor area less than or equal to 400 m2 there should be at least two extinguishers with a class A, having a combined minimum total fire rating of 26A. 

Any storey with a floor area exceeding 400 m2, there should be at least two extinguishers with a class A rating of a combined minimum total fire rating of 0.065 × floor area of the storey (in square metres). 

Check out http://www.firesafe.org.uk/portable-fire-extinguisher-general/  




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  • 3 months later...

Is a water mist fire extinguisher suitable for a 20 square meter squatter settlement where these use kerosene stoves very close to bed and couches? What is the minimum water pressure that water mist can be achieved under?

Edited by Safelincs
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Hi Sardac

The water mist extinguishers would be well suited in such an application. They cover soft furnishing fires as well as a potential spill of the kerosene or other fuel. Due to the many unknowns I would go for the largest version (6 litres). A great advantage of water mist in this setting is that the water mist jet cannot injure a person, can be used on a person with clothing on fire and causes minimal damage to anything in the building. Equally, a malicious release of the extinguisher causes minimum harm. The extinguishers are also ideal for untrained persons as the cloud of mist creates a cooling barrier between the person using the extinguisher and the fire.

The pressure in the extinguisher is 12 bar


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Yes, water mist would suit although they don't have an official Class B rating due to the low performance per unit of agent not meeting EN3 minimums, although with kerosine/paraffin this isn't as big an issue as with other fuels.

Foam spray would also suit

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