Carbon dioxide fire extinguishers are designed for fires involving flammable liquids (Class B fires) and electrical equipment (Class C fires). They are effective for fuels such as gasoline, oil, alcohol, solvents, diesel, kerosene, propane, butane, and natural gas. These extinguishers work by displacing oxygen and cooling the fire without leaving residue, making them ideal for use around sensitive electronics. However, they are not suitable for fires involving solid fuels like wood, paper, or cloth (Class A fires), nor for cooking oils and fats (Class K or F fires), as they can spread those flames. In summary, carbon dioxide extinguishers are designed primarily for Class B fuels (flammable liquids and gases) and electrical fires, but not for solid or cooking oil fires.