Extinguishers suitable for Class B fires can be identified by a symbol containing which color?

Class B fires involve flammable liquids such as gasoline, oil, and grease. The extinguishers designed for these types of fires are marked with a red square symbol. This distinctive symbol indicates that the extinguisher is effective for combating flammable liquids, which helps firefighters and individuals quickly identify the appropriate equipment in an emergency.

The use of color coding in fire extinguisher symbols provides a clear and immediate visual cue for the type of fire each extinguisher is suited for, ensuring safety and effectiveness during a firefighting situation. In contrast, other colors represent different classes of fires; for example, a green triangle is used for Class A fires (ordinary combustibles), while the yellow diamond designates Class D fires (combustible metals).