CompTIA: Advanced Security Practitioner (CASP) Exam Prep

Answer: A - Type B is used on flammable liquids and the composition consists of fire-retardant chemicals.

Key takeaway: Class A fires involve ordinary solid combustibles. Class B fires involve flammable or combustible liquids such as gasoline, kerosene, grease, and oil. Class C fires are those caused by energized electrical equipment. The numerical rating for class B extinguishers indicates the approximate number of square feet of fire it can extinguish. Many fire extinguishers can handle multiple types of fires, the most common combination being for both B and C type fires, though “tri-class” extinguishers handle A, B, and C class fires. ABC fire extinguishers are best suited for network infrastructure environments.