1. FIRE Herb Krelle assembled by
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2. The Fire Triangle
In order to understand how fire extinguishers work, you first need to know a little bit about fire.

3. The Fire Triangle
In order to understand how fire extinguishers work, you first need to know a little bit about fire.
Fire is a chemical reaction involving rapid oxidation (burning) of a fuel.

4. The Fire Triangle
Four things must be present at the same time in order to produce fire:

5. The Fire Triangle
FUEL - any combustible material - solid, liquid or gas. Most solids and liquids must vaporize before they will burn.

6. The Fire Triangle
FUEL - any combustible material - solid, liquid or gas. Most solids and liquids must vaporize before they will burn.
OXYGEN - Sufficient oxygen must be present in the atmosphere surrounding the fuel for fire to burn.

7. The Fire Triangle
FUEL - any combustible material - solid, liquid or gas. Most solids and liquids must vaporize before they will burn.
OXYGEN - Sufficient oxygen must be present in the atmosphere surrounding the fuel for fire to burn.
HEAT- Sufficient heat energy must be applied to raise the fuel to it's ignition temperature

8. The Fire Triangle
FUEL - any combustible material - solid, liquid or gas. Most solids and liquids must vaporize before they will burn.
OXYGEN - Sufficient oxygen must be present in the atmosphere surrounding the fuel for fire to burn.
HEAT- Sufficient heat energy must be applied to raise the fuel to it's ignition temperature
Chemical, exothermic reaction - This reaction can occur when all three of the above elements are present in the proper conditions and proportions. Fire (rapid oxidisation) is the result of this chemical reaction.

9. The Fire Triangle
FUEL - any combustible material - solid, liquid or gas. Most solids and liquids must vaporize before they will burn.
OXYGEN - Sufficient oxygen must be present in the atmosphere surrounding the fuel for fire to burn.
HEAT- Sufficient heat energy must be applied to raise the fuel to it's ignition temperature
Chemical, exothermic reaction - This reaction can occur when all three of the above elements are present in the proper conditions and proportions. Fire (rapid oxidisation) is the result of this chemical reaction.

10. The Fire Triangle
FUEL - any combustible material - solid, liquid or gas. Most solids and liquids must vaporize before they will burn.
OXYGEN - Sufficient oxygen must be present in the atmosphere surrounding the fuel for fire to burn.
HEAT- Sufficient heat energy must be applied to raise the fuel to it's ignition temperature
Chemical, exothermic reaction - This reaction can occur when all three of the above elements are present in the proper conditions and proportions. Fire (rapid oxidisation) is the result of this chemical reaction.
Fire extinguishers put out fire by taking away one or more elements of the fire triangle/tetrahedron.

11. Classes of fires
Fires are categorized into classes according to the type of fuel or the dangers present.

12. Classes of fires
Class A Extinguishers will put out fires in ordinary combustibles, such as wood and paper.
Class B Extinguishers should be used on fires involving flammable liquids, such as grease, gasoline, oil, etc.
Class C Extinguishers should be used on fires involving flammable gas.
Class D Extinguishers are designed for use on flammable metals and are often specific for the type of metal in question.
Class E Extinguishers are suitable for use when electricity is present.
Class F Extinguishers are suitable for cooking oils and fats.

13. Classes of fires
Class A Extinguishers will put out fires in ordinary combustibles, such as wood and paper.
Class B Extinguishers should be used on fires involving flammable liquids, such as gasoline, oil, etc.
Class C Extinguishers should be used on fires involving flammable gas.
Class D Extinguishers are designed for use on flammable metals and are often specific for the type of metal in question.
Class E Extinguishers are suitable for use when electricity is present.
Class F Extinguishers are suitable for cooking oils and fats.

14. Classes of fires
Class A Extinguishers will put out fires in ordinary combustibles, such as wood and paper.
Class B Extinguishers should be used on fires involving flammable liquids, such as gasoline, oil, etc.
Class C Extinguishers should be used on fires involving flammable gas.
Class D Extinguishers are designed for use on flammable metals and are often specific for the type of metal in question.
Class E Extinguishers are suitable for use when electricity is present.
Class F Extinguishers are suitable for cooking oils and fats.

15. Classes of fires
Class A Extinguishers will put out fires in ordinary combustibles, such as wood and paper.
Class B Extinguishers should be used on fires involving flammable liquids, such as gasoline, oil, etc.
Class C Extinguishers should be used on fires involving flammable gas.
Class D Extinguishers are designed for use on flammable metals and are often specific for the type of metal in question.
Class E Extinguishers are suitable for use when electricity is present.
Class F Extinguishers are suitable for cooking oils and fats.

16. Classes of fires
Class A Extinguishers will put out fires in ordinary combustibles, such as wood and paper.
Class B Extinguishers should be used on fires involving flammable liquids, such as gasoline, oil, etc.
Class C Extinguishers should be used on fires involving flammable gas.
Class D Extinguishers are designed for use on flammable metals and are often specific for the type of metal in question.
Class E Extinguishers are suitable for use when electricity is present.
Class F Extinguishers are suitable for cooking oils and fats.

17. Classes of fires
Class A Extinguishers will put out fires in ordinary combustibles, such as wood and paper.
Class B Extinguishers should be used on fires involving flammable liquids, such as gasoline, oil, etc.
Class C Extinguishers should be used on fires involving flammable gas.
Class D Extinguishers are designed for use on flammable metals and are often specific for the type of metal in question.
Class E Extinguishers are suitable for use when electricity is present.
Class F Extinguishers are suitable for cooking oils and fats.

18. Types of extinguishers
Water (under air pressure) Class of Fire: A
All Red body

19. Types of extinguishers
Water (under air pressure)
All Red body
Dry Chemical Powder - Class of Fire: A, B, C, (E) and F
Red body White band

20. Types of extinguishers
Water (under air pressure)
All Red body
Dry Chemical Powder - Class of Fire: A, B, C, (E) and F
Red body White band
Foam - Class of Fire: A and B
Blue or Red with Blue band.

21. Types of extinguishers
Water (under air pressure)
All Red body
Dry Chemical Powder - Class of Fire: A, B, C, (E) and F
Red body White band
Foam - Class of Fire: A and B
Blue or Red with Blue band.
Carbon Dioxide (CO2) - Class of Fire: A, B, (E) and F
Red with Black band.

22. Types of extinguishers
Water (under air pressure)
All Red body
Dry Chemical Powder - Class of Fire: A, B, C, (E) and F
Red body White band
Foam - Class of Fire: A and B
Blue or Red with Blue band.
Carbon Dioxide (CO2) - Class of Fire: A, B, (E) and F
Red with Black band.
Wet Chemical - Class of Fire: A and F Buff or Red with Buff band.

23. Types of extinguishers
Water (under air pressure)
All Red body
Dry Chemical Powder - Class of Fire: A, B, C, (E) and F
Red body White band
Foam - Class of Fire: A and B
Blue or Red with Blue band.
Carbon Dioxide (CO2) - Class of Fire: A, B, (E) and F
Red with Black band.
Wet Chemical - Class of Fire: A and F Buff or Red with Buff band.
Vaporizing Liquid - Class of Fire: A, B, C and (E)
Red with Yellow Band

24. Types of extinguishers
Water (under air pressure)
All Red body
Dry Chemical Powder - Class of Fire: A, B, C, (E) and F
Red body White band
Foam - Class of Fire: A and B
Blue or Red with Blue band.
Carbon Dioxide (CO2) - Class of Fire: A, B, (E) and F
Red with Black band.
Wet Chemical - Class of Fire: A and F Buff or Red with Buff band.
Vaporizing Liquid - Class of Fire: A, B, C and (E)
Red with Yellow Band
Halon (BCF) - Do not use now illegal, environmental hazard.
All Yellow

25. Types of extinguishers
Water (under air pressure)
All Red body
Dry Chemical Powder - Class of Fire: A, B, C, (E) and F
Red body White band
Foam - Class of Fire: A and B
Blue or Red with Blue band.
Carbon Dioxide (CO2) - Class of Fire: A, B, (E) and F
Red with Black band.
Wet Chemical - Class of Fire: A and F Buff or Red with Buff band.
Vaporizing Liquid - Class of Fire: A, B, C and (E)
Red with Yellow Band
Halon (BCF) - Do not use now illegal, environmental hazard.
All Yellow

26. Types of extinguishers
Water (under air pressure)
All Red body
Dry Chemical Powder - Class of Fire: A, B, C, (E) and F
Red body White band
Foam - Class of Fire: A and B
Blue or Red with Blue band.
Carbon Dioxide (CO2) - Class of Fire: A, B, (E) and F
edith Black band.
Wet Chemical - Class of Fire: A and F Buff or Red with Buff band.
Vaporizing Liquid - Class of Fire: A, B, C and (E)
Red with Yellow Band
Halon (BCF) - Do not use now illegal, environmental hazard.
All Yellow

28. Hose reels Hose reals are a familiar feature in public places.
Hose reals should only be used when there is no other way out, the first option in any fire situation is to get out and call 000

29. The End