Before revision: 220px|The fire triangle The fire triangle or combustion triangle is a simple model for understanding the three ingredients for most fires.The Fire Triangle , Hants Fire brigade, accessed June 2009 The triangle illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually oxygen).
After revision: 220px|The fire triangle The fire triangle or combustion triangle is a simple model for understanding the necessary ingredients for most fires.The Fire Triangle , Hants Fire brigade, accessed June 2009 The triangle illustrates the three elements a fire needs to ignite: heat, fuel, and an oxidizing agent (usually oxygen).