Under which category does an extinguisher rated 'B' fall?

An extinguisher rated 'B' is specifically designed to put out fires involving flammable liquids. This category includes substances like gasoline, oil, grease, and various solvents that can ignite and burn with high intensity. The 'B' rating signifies that the extinguisher contains agents effective for suppressing such fires, typically using foam, carbon dioxide, or dry chemical agents that work by either smothering the fire, cooling the burning material, or interrupting the chemical reaction.

Understanding fire classifications is critical for both safety and effective fire response procedures, as using the wrong type of extinguisher on a specific class of fire can be ineffective or even dangerous.