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,t xD <br /> •oAll You Ever Wanted t® <br /> n®w <br /> MR CUE- About Fire Extinguishers . . . <br /> E-RES <br /> There are basically four different types or classes of fire extinguishers, each of which <br /> extinguishes specific types of fire. Newer fire extinguishers use a picture/labeling system to <br /> designate which types of fires they are to be used on so users can quickly identify the classes <br /> of fire on which the extinguisher will be effective.. Older fire extinguishers are labeled with <br /> colored geometrical shapes with letter designations. Both of these types of labels are shown <br /> below with the description of the different classes of extinguishers. <br /> Also located on the fire extinguisher label is the UL rating. The UL rating is broken down <br /> into Class A and Class B:C ratings. These numerical ratings allow you to compare the <br /> relative extinguishing effectiveness of various fire extinguishers. For example, an <br /> extinguisher that is rated 4A:20B:C indicates the following: <br /> 1. The A rating is a water equivalency rating. Each A is equivalent to 1 1/4 gallons of <br /> water. 4A= 5 gallons of water. <br /> 2. The B:C rating is equivalent to the amount of square footage that the extinguisher can <br /> cover, handled by a professional. 20 B:C=20 square feet of coverage. <br /> 3. C indicates it is suitable for use on electrically energized equipment. <br /> When analyzing these ratings, note there is not a numerical rating for Class C or Class D <br /> fires. Class C fires are essentially either a Class A or a Class B fire involving energized <br /> electrical equipment where the fire extinguishing media must be non-conductive. The fine <br /> extinguisher for a Class C fire should be based on the amount of the Class A or Class B <br /> component. For extinguisher use on a Class D fire, the relative effectiveness is detailed on <br /> the extinguisher nameplate for the specific combustible metal fire for which it is <br /> recommended. <br /> Fire Extinguisher Ratings <br /> Class A Extinguishers will put out fires in ordinary combustibles, <br /> [a <br /> such as wood and paper. The numerical rating for this class of fire <br /> extinguisher refers to the amount of water the fire extinguisher Ordinary <br /> C, 6q� holds and the amount of fire it will extinguish. combugnetos <br />