What is the required size of a class K wet chemical fire extinguisher protecting solid fuel cooking appliances with a 5 ft volume box?

The correct choice for the size of a Class K wet chemical fire extinguisher for protecting solid fuel cooking appliances with a 5 ft³ volume box is 1.6 gallons. This size aligns with the requirements set forth by the National Fire Protection Association (NFPA) standards, which specify that the size of the Class K fire extinguisher must be based on the size and type of cooking equipment being protected.

Class K extinguishers are specifically designed to address fires that involve cooking oils and fats, which can occur in commercial kitchens. The NFPA guidelines dictate that for a cooking appliance with a specific volume, the extinguisher must be able to effectively suppress potential fires. In this case, a Class K extinguisher rated for 1.6 gallons has been determined to be suitable for a cooking appliance size of 5 ft³.

This requirement helps ensure that there is enough extinguishing agent available to respond effectively to a fire situation involving solid fuels, which can generate intense heat and require a specific volume of extinguishing agent to combat.