Fires are classified by the type of fuel that is burning.

Class	Description
A	These fires consist of ordinary combustibles such as wood, paper, fabric, plastic, and most kinds of trash.
B	These are fires whose fuel is flammable or combustible liquid or gas such as gasoline, oil, propane, or natural gas.
C	These are fires involving potentially energized electrical equipment, short-circuiting machinery, or overloaded electrical cables.
D	These fires consist of combustible metals such as magnesium, potassium, titanium, and zirconium.
K	These fires involve unsaturated cooking oils in well-insulated cooking appliances located in commercial kitchens.