What is the minimum requirement for solid fuel cooking appliances with a firebox volume of 5 ft or less?

The minimum requirement for solid fuel cooking appliances with a firebox volume of 5 ft or less is a 2-A rated water-type extinguisher or a 1.6 gallon wet chemical fire extinguisher. This is due to their effectiveness in combating fires that could occur with solid fuels, which typically produce class A fires involving combustible materials like wood or paper, as well as class K fires associated with cooking oils and fats.

A 2-A rated water-type extinguisher is suitable for dealing with ordinary combustible materials, while the 1.6 gallon wet chemical extinguisher is specifically designed to combat fire risks associated with cooking appliances, particularly those that utilize higher heat and grease. This dual option provides flexibility in meeting safety requirements, catering to different types of cooking surfaces and materials, ensuring that both types of fires can be effectively managed.

In contrast, the other options do not fully meet the requirements outlined for solid fuel cooking appliances. Specifically, foam extinguishers and other water-type extinguishers at different capacity levels either lack the appropriate rating or do not match the necessary content and effectiveness for this application.