Examples of heat sources

Electrical - Portable heaters, lamps, power connection, electrical appliance, tools, machines, etc.

Open Flame - Open flame burners and heaters, candles, lighters, matches, etc.

Mechanical - Machines, compressors, moving parts, friction, etc.

Chemical - Catalytic reactions, oxidation, spontaneous combustion etc.

Examples of Fuel Sources

Flammable Liquids - gasoline, solvents, acetone, alcohol, paint thinner, etc.

Flammable Gases - towngas, natural gases, hydrogen, acetylene, etc.

Wood - desks, cabinets, wall panels, boxes, lumber, sawdust, etc.

Paper - packaging, cardboards, books, etc.

Organic Materials - grain and flour dust, plants, grass, etc.

Fabrics - clothing, curtains, carpets, awnings, etc.

Metals - potassium, magnesium, sodium, lithium, etc.