Class B – Flammable or combustible liquids & gases
In this Class B fires involve flame able or combustible liquids and gases such as gasoline, diesel fuel, paint, paint thinners, and propane.

Class C - Energized electrical equipment
As long as it's "plugged in " it would be considered a class C fire. Include fires involving all electricals items, and machinery

Class D - Combustible metals
these materials use in an industry. A Class D fire involves combustible metals such as sodium, potassium, magnesium, and Titanium It takes special extinguishing agents (Metal - X, foam) to fight such a fire. The background of the symbol will be either Metallic or Yellow, if in color.

Class K – Cooking media
In this class involve cooking appliances that use cooking media such as vegetable or animal oils and fats. Extinguishers that are suitable for Class K fires are identified by the letter “K”.

Types of fire extinguishers
It is vitally important to always use the right type of fire extinguisher when putting out a small fire. Leave big fires to the Fire Department. Different types of fire extinguishers are designed to fight different classes of fire. The three most common types of fire extinguishers are:

Water (APW)

Carbon Dioxide (CO)

Dry Chemical (ABC, BC, DC)

Wet Chemical