Portable Fire Extinguishers: Principles

Slightly modified from a web resource: http://www.fireworld.net/fire_inspection/portable.htm.

Portable Fire Extinguishers Principles

  1. Classes of fire
  2. Fire extinguisher rating system
  3. (c) Class C extinguishers have no numerical rating, the agents are tested only to determine non- conductivity.
  4. (d) Class D extinguishers have no numerical rating, however the exact type of metal the extinguisher is designed for must be on the label. The agents used, called Dry Powders, are tested for:
    1. Reactivity
    2. Toxicity
    3. Toxicity of fumes produced
    4. Metal burnout vs. extinguishment.
  5. (c) Multiple purpose extinguishers
    1. ABC - Dry chemical
    2. BC - CO2, Dry chemical, Halon
    3. No extinguisher is rated for all four classes.
  6. Extinguisher Marking System
  7. (b) Pictures
    1. Class A - Trash can, campfire
    2. Class B - Gas can
    3. Class C - Outlet and plug
    4. Class D - No standard picture, just the yellow star
  8. (c) Pictures and shapes indicate the suitability of the extinguisher as well as the unsuitability. A red line will be drawn through the picture if unsuitable.
  9. Types of Portable Fire Extinguishers
  10. General Fire Extinguisher Inspection
  11. Specific things to inspect

Lesson plans are provided as a guide for the purpose of training only.
Different rules, requirements and techniques may be applicable in your area.
Please check all local guidelines and procedures for variances in application of the above plans.