... ; 3 delivery in time; 4 OEM offered Heating furnace/air furnacebrief introduction:Direct type air heater is by the way of directly ... oil, heavy oil.3, gas fuel, such as: coal gas, natural gas, liquid gas. High temperature combustion gas got after the fuel combustion contact ... room or baking room, to contact the dried material, heating and water evaporation, thus obtain the dry products. In order to ...