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| Class | Symbol | Type of Fire and Examples | Extinguisher Choice |
| A |
 |
Common Combustibles: wood, paper, cloth, etc. Deep seated states of materials most difficult Proper agent to "Hot Spot" Thorough overhaul of material necessary |
 Class A |
| B |
 |
Flammable liquids and gases: gasoline, propane and solvents Spill fires Obstacle fires Fuel-in-depth fires Gravity/3-dimensional fires Pressure fires |
 Class AB |
| C |
 |
Live
electrical equipment: Computers, fax machines Energized electrical situations |
 Class ABC |
| D |
 |
Combustible metals: Magnesium, lithium, and titanium Flammable metals |
 Class D |
| K |
 |
Cooking Media: Cooking oils and fats |
 Class AK |
Fire extinguisher categories are the ratings for fire extinguishers. Before you pick the fire extinguisher cabinet you should know the fire extinguisher categories to choose the correct fire extinguisher.
Fire Extinguisher Rates for ABC Type
| Nominal Capacity |
PSI
|
Range (Feet)
|
U/L Rating |
Coast Guard Approved
|
| 2.5 lb | 150 | 8-12 | 1A10BC | - |
| 2.5 lb | 150 | 8-12 | 1A10BC | Yes |
| 5 lb | 195 | 10-15 | 2A10BC | ONLY WITH SECURITY BRACKET |
| 5 lb | 195 | 10-15 | 2A10BC | Yes |
| 5 lb | 195 | 10-15 | 3A40BC | ONLY WITH SECURITY BRACKET |
| 5 lb | 195 | 10-15 | 3A40BC | Yes |
| 10 lb | 235 | 10-15 | 4A80BC | ONLY WITH SECURITY BRACKET |
| 20 lb | 235 | 12-18 | 10A120BC | - |
