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Class E Extinguishers should be used on fires involving <br /> flammable liquids, such as grease, gasoline, oil, etc. The numerical <br /> rating for this class of fire extinguisher states the approximate <br /> number of square feet of a flammable liquid fare that a non-expert Fla, blv <br /> person can expect to extinguish. LfgU1ds <br /> Class C Extinguishers are suitable for use on electrically <br /> energized fires. This class of fire extinguishers does not have a <br /> numerical rating. The presence of the letter"C" indicates that the <br /> exp oar <br /> �wa <br /> extinguishing agent is non-conductive. sent <br /> Class D Extinguishers are designed for use on flammable metals <br /> and are often specific for the type of metal in question. There is no D <br /> picture designator for Class D extinguishers, These extinguishers <br /> generally have no rating nor are they given a multi-purpose rating c.mbm1619 <br /> for use on other types of fires. <br /> Class K Extinguishers are used on fires involving cooking media <br /> (fats, grease, and oils) in commercial cooking sites such as <br /> restaurants. These fire extinguishers work on the principle of <br /> saponification. Saponification takes place when alkaline mixtures, <br /> such as potassium acetate,potassium citrate,or potassium <br /> carbonate, are applied to burning cooking oil or fat. The alkaline <br /> mixture combined with the fatty acid creates a soapy foam on the <br /> surface that holds in the vapors and steam and extinguishes the fire. <br /> These extinguishers are identified by the letter K. <br /> are designed for use on flammable metals and are often specific for <br /> the type of metal in question. <br /> Multi-Class Ratings <br />