Stored pressure extinguishers have the compressed nitrogen gas that is used as the propellant for the dry chemical agent stored in the same canister as the dry chemical. Side cartridge operated units store the dry chemical in a non-pressurized container and the compressed nitrogen gas in a separate cartridge.AFFF (Aqueous Film Forming Foams) Foam Fire Extinguishers are suitable to fight burning solids such as wood as well as liquid fires such as burning petrol. The foam has the ability to creep over the burning liquid or to soak into burning materials such as settees.
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