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Extinguishers & Signage

It is a legal requirement for every UK business to have fire extinguishers.
There are different types of extinguishers:

9Ltr Water Extinguisher
Fire Rating: 13A
BS EN3 KM 503518
This is used to fight Class A fires, involving solids such as wood, paper, plastics and upholstery.
It works by cooling and removing heat.
Do not use on burning fat, oil and electrical appliance fire.
Foam Extinguisher (AFFF: Aqueous Film Forming Foam)
Fire Rating: 13A-144B
BS EN3 KM 503518
This is used to fight all Class A & Class B fires involving solids such as wood, paper, plastics, cloth and flammable liquids such as oil, petrol, spirits & paints.

It requires some skill when dealing with liquid fire.  It works by forming a film over the surface of the burning object, sealing it and thus excluding oxygen.
The "blanket of foam" should start at the rear of the fire and lay a foam surface across the top of the fire.

Do not use on domestic chip pan.

CO2 Extinguisher
Fire Rating: 38B
BS EN3 KM 503518

This is used to fight electrical fires Class E and flammable liquids Class B.

It works by cutting off the oxygen supply to the fire - thus smothering the fire.

Do not use on paper, wood, plastic, fabric and flammable gases.


Powder Extinguisher 
Fire Rating: 34A / 183B / C
BS EN3 KM 503518
This is a multiclass extinguisher due to its capability for fighting solid, flammable liquid, gases and electric fires.  
It is very fast acting. However, it has little or no cooling effect, therefore re-ignition is a possibility and it leaves a distributed mess in the form of powder.
It works on all classes of fires, A, B & C.  However, there is a risk of explosion on metal fires and gaseous fires.






Wet Chemical Extinguisher
Fire Rating: 13A / 113B / 75F
BS EN 3 KM 28000
This is designed specifically to fight Class F fires involving cooking oil and fat.
It works by saponification (turning the top layer to a soapy substance).