Firefighter Practice Exam

What is the primary use for Class A fire extinguishers?

1. Flammable liquids

2. Ordinary combustibles like wood and paper

3. Electrical equipment

4. Flammable metals

The correct answer is: Ordinary combustibles like wood and paper

Class A fire extinguishers are specifically designed for ordinary combustibles, which include materials such as wood, paper, and textiles. These types of fires are common in residential and office environments, making Class A extinguishers a fundamental tool for fire safety. The extinguishing agents in Class A extinguishers, such as water, are effective at absorbing heat and cooling the burning materials to extinguish the fire. The focus on ordinary combustibles distinguishes Class A extinguishers from other classes which are intended for different types of fires; for instance, Class B for flammable liquids involves different extinguishing agents and methods due to the nature of those fuels. Therefore, the primary use of Class A fire extinguishers centers on combating fires fueled by everyday materials found in most living and working spaces.