The classic fire triangle consists of an ignition source, a fuel, and an oxidizer – all of which are needed to produce a fire.
Unfortunately, it is often easy to find all three in many manufacturing facilities around various dust collection points and in collectors.
Sparks, heat, or embers from many processes can become ignition sources. The dust, fume, or mist being produced and collected may provide fuel. Air used to transport dust, fume, or mist to a collector then provides the last component, an oxidizer.