Extinguishers are classified by letters and numbers. The numbers indicate the size of fire the extinguisher will put out compared to other extinguishers. For example, a 10B:C extinguisher contains more chemicals and will put out a larger fire than a 5B:C extinguisher. The letters indicate the types of fires the extinguisher will put out.
- Class A fires are of combustible solids like wood.
- Class B fires are of flammable liquids like gasoline or oil.
- Class C fires are electrical fires.