Question

What type of extinguishers require a rating number before the letter and what does it indicate?

a) Class C extinguishers; it indicates their capacity
b) Class A extinguishers; it indicates the chemical composition
c) Class D extinguishers; it indicates the discharge method
d) Class B extinguishers; it indicates their firefighting capability

Answer 1

Class A and Class B fire extinguishers require a rating number before the letter, indicating their firefighting capability for specific types of fires.

Step-by-step explanation:

The types of fire extinguishers that require a rating number before the letter are Class A and Class B extinguishers. In the case of Class A extinguishers, the number indicates the equivalent amount of water (in gallons) the extinguisher can effectively disperse, and it represents the unit's firefighting capability for ordinary combustibles, like wood and paper. For Class B extinguishers, the number signifies the approximate square footage the extinguisher can cover, specifically for flammable liquid fires. Therefore, the correct answer to the question is (d) Class B extinguishers; it indicates their firefighting capability.