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Fire Extinguisher Training <br /> Class C: Electrical—energized electrical equipment. As long as it is <br /> "plugged in." <br /> Class D: Metals—potassium, sodium, aluminum, magnesium. <br /> Requires Metal-X, foam, and other special extinguishing agents. <br /> Most fire extinguishers will have a pictograph label telling you which types of fire the <br /> extinguisher is designed to fight. <br /> For example, a simple water extinguisher might have a <br /> label like this, which means it should only be used on <br /> Class A fires. � <br /> TYPES OF FIRE EXTINGUISHERS <br /> Different types of fire extinguishers are designed to fight different classes of fire. The <br /> three most common types of fire extinguishers are: <br /> 1. Water (APW) <br /> Will have gauge <br /> Large, silver fire extinguishers <br /> that stand about 2 feet tall and <br /> weigh about 25 pounds when <br /> full. .All <br /> APW stands for "Air-Pressurized HPW <br /> Water." <br /> Filled with ordinary tap water <br /> and pressurized air, they are <br /> essentially large squirt guns. <br /> APW's extinguish fire by taking away the "Heat" element of the Fire Triangle. <br /> APW's are designed for Class A fires only: Wood, paper, cloth. Here are a <br /> couple of reasons you need to be careful about which extinguisher you use: <br /> Using water on a flammable liquid fire could cause the fire to spread. <br /> Oklahoma State University Page 2 <br />