Each fire extinguisher on market today is categorized through an alphanumeric rating. This rating actually signifies the type and size of fires a fire extinguisher can handle. The class of fire the fire extinguisher can put out is categorized through letters. Class A refers to the fires caused by ordinary combustibles such as wood, paper, trash, etc, Class B refers to the fires that result from flammable liquids, Class C refers to fire outbreaks due to electrical equipment, Class D refers to fire incidents caused by metals and Class K refers to the fires produced by cooking oils and fats. The numbers found before A indicate the equivalent quantity of water the fire extinguisher holds. For example, every number is as effective as 1 ¼ gallon of water whereas 2A means that the fire extinguisher is equivalent to 2 ½ gallon of water. The numbers located before the letters B and C represent the number of square feet or discharge range the fire extinguisher can put out. Let’s take 10B:C as an example where a fire extinguisher can diminish fire to a maximum range of 10 feet.