From a service and maintenance standpoint, here’s the meat:
- NFPA 10, Section 4-3.1, requires that fire extinguishers be inspected when initially installed and thereafter at approximately 30-day intervals.
- Section 4-4.1 on maintenance says that fire extinguishers should be maintained at intervals of not more than 1 year, at the time of hydrostatic test, or when specifically indicated by an inspection.
- In addition, Section 4-4.3 requires that stored-pressure fire extinguishers that require a 12-year hydrostatic test shall be emptied and subjected to the applicable maintenance procedures every six years.
- Class A: Fires that involve wood, cloth, rubber, paper, and some types of plastics.
- Class B: Fires that involve gasoline, oil, paint, natural and propane gases, and flammable liquids, gases, and greases.
- Class C: Fires that involve all the materials found in Class A and B fires, but with the introduction of an electrical appliances, wiring, or other electrically energized objects in the vicinity of the fire.
- Class D: Fires that involve combustible metals, such as sodium, magnesium, and potassium.