What type of fire extinguisher should be kept on-site when working with flammable refrigerants?

• A. Class A
• B. Class B
• C. Class C
• D. Class D

Answer: (B)

The correct choice of a fire extinguisher for use when working with flammable refrigerants is a Class B extinguisher. Class B extinguishers are specifically designed to combat fires that involve flammable liquids, gases, and vapors. Since many refrigerants fall into this category, having a Class B extinguisher onsite provides an appropriate means of addressing potential fire hazards associated with these substances.

Flammable refrigerants can easily ignite and create hazardous conditions. Using a Class B extinguisher allows for the effective suppression of fires involving these materials, as it is formulated to smother flames and prevent the fire from spreading. It typically contains specific extinguishing agents, such as foam, carbon dioxide, or dry chemical agents, that work well against flammable liquid fires.

The other types of fire extinguishers are not suitable for flammable refrigerants. Class A extinguishers are intended for ordinary combustible materials like wood, paper, and cloth; Class C extinguishers are suitable for electrical fires; and Class D extinguishers are designed for combustible metals. Therefore, when working with flammable refrigerants, the most effective and appropriate choice is a Class B fire extinguisher.