The symbol may be found on dry chemical extinguishers. Choosing a fire extinguisher Only choose extinguishers that have been tested by an approved testing laboratory and labeled for their intended use. The extinguisher must be appropriate for the type and size of fire being fought. It is important to select the appropriate extinguisher for the correct fire classification. Using the wrong type of extinguisher can make the fire worse and is dangerous to the operator.
Fire is a combination of oxygen, fuel and heat.
This is called a Fire Triangle. Read operator's manual for inspection, installation and maintenance instructions. Rechargeable models MUST be serviced after every use. Disposable extinguishers are very limited and can be used only once. Holding the extinguisher with the nozzle pointing away from you, remove the pin, seal or lever release mechanism.