Ontario Security Guard Practice Test – Prepare for the 2025 Exam & License Test

A fire needs three essential components to start and grow: oxygen, heat, and fuel. This is often referred to as the fire triangle. Oxygen is needed for any kind of combustion process to take place. In the case of a fire, it allows the process of combustion to continue and the fire to sustain itself. Heat is the second necessary part, it raises the material to its ignition temperature. The last ingredient is fuel, which is any kind of combustible material that the fire can use as a source of energy. Therefore, the combination of oxygen, heat, and fuel is necessary for a fire to start and grow.