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Chapter 7 - Portable Fire Extinguishers

  • Portable fire extinguishers are effective for fighting fires only if the extinguisher is suitable for the of fire.
  • There are five classes of fire:
    • Class A: ordinary such as wood, paper, and cloth.
    • Class B: flammable or combustible .
    • Class C: energized equipment.
    • Class D: combustible such as magnesium.
    • : combustible cooking oils and fats.
  • Extinguishers are rated by independent testing laboratories according to the class or classes of fire the units can extinguish.
  • Portable fire extinguishers that are rated for use on Class A and fires are also rated numerically according to the size of the fire they can extinguish.
  • The where a fire is likely to take place is an important factor in choosing the proper extinguisher.
  • Environments are classified in three major hazard groups: light, ordinary, and .
  • The basic steps of fire extinguisher operation are: locate, select, transport, activate, and .
  • The common types of fire extinguishers are: water, dry chemical, carbon dioxide, foam, halogenated agents, dry powder, and .
  • Selecting the best fire extinguisher depends on the type of material burning, the size of the fire, the location of the fire, the effectiveness of the extinguisher, the ambient temperature, and conditions.
  • Extinguishers differ in how their extinguishing agents are and expelled.
  • Fire extinguishers must be regularly inspected, maintained, recharged, and tested.

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