Class B fires involve flammable liquids and gases, such as gasoline, oil, and propane. These fires can occur in various settings, including homes, garages, and industrial areas. The flames can spread quickly, making them particularly dangerous. To extinguish a Class B fire, it is essential to use the right type of fire extinguisher, specifically one labeled for Class B fires. Water should never be used, as it can spread the flames. Instead, foam, dry chemical, or carbon dioxide extinguishers are effective in smothering the fire and cutting off its oxygen supply.