... ; 3 delivery in time; 4 OEM offered Heating furnace/air furnacebrief introduction:Direct type air heater is ... coal, coke.2, liquid fuel, such as: diesel oil, heavy oil.3, gas fuel, such as: coal gas, natural ... or baking room, to contact the dried material, heating and water evaporation, thus obtain the dry products ... burning device, such as: coal burner, fuel oil burner, coal gas burner and so on. The ...