... .Automatically temperature-testing 3 Low fuel consumption Coal Fired Type Air Heater Applicable Range:1. Processing and drying for chemical, textile, pharmacy ... 1.Solid fuel---like coal, coke.2.Liquid fuel---like diesel, heavy oil.3.Gas fuel---like coal gas, natural gas ... sensitivity, like milk powder, synthetic resin. This heating device heats air by various forms of heat exchanging. The larger of the ...