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LESSON 3: SAFETY AND EMERGENCY INFORMATION 3-15 Types of Fire Extinguishers Listed below are common types of fire extinguishers: Water Class A fires only. Inappropriate for Class B Regular Dry Primarily sodium bicarbonate, effective Chemical against Class B and C fires. Multi-Purpose Monoammonium phosphate is effective Dry Chemical against Class B and C fires. Carbon Dioxide Effective against Class B and C fires, Gas (CO 2 ) often used in areas where contamination and Ratings of Fire Extinguishers Fire extinguishers come with UL rating. The higher the rating number, the more capacity for extinguishing the class of fire indicated. The following is a general guide for selecting a fire extinguisher. Minimum extinguisher ratings are listed. Cheek your local fire department codes for detailed information: Light Hazard 2A, 5B:C or greater (possibility of small fires) Ordinary Hazard 2A, 10B:C or greater (possibility of moderate fires) Extra Hazard 4A, 40B:C or greater (possibility of severe fires) Fire Extinguisher Inspection Fire extinguishers are pressurized devices. Monthly inspections should be made to verify that all extinguishers have retained their full charge. |