... operate 2.Large application range 3.Automatically temperature-testing Industrial Oil Gas Heater,Oil Fuel Hot Air Furnace Fuel:1.Solid fuel---like ... , coke.2.Liquid fuel---like diesel, heavy oil.3.Gas fuel---like coal gas, natural gas, liquid gas.Applicable Range:1. Processing and drying for ... , the better energy-saving effect of the heating furnace. Industrial Oil Gas Heater,Oil Fuel Hot Air Furnace