Automatic baking tunnel oven usually have three main types：
Gas oven，Electrical oven and Hot air circulation oven depends on the natural resources of different needs and countries.
ELECTRICAL OVEN-FAR INFRARED HEATIN
The working principle is by the far-infrared heating element their arrangement and control make the heating uniform, there is an exhaust system to collect the steam and exhaust.
GAS OVEN-DIRECT-FIRED OVEN
The working principle is gas ribbon burners fitted directly into the baking chamber. Various burner types make it possible to make a unique baking profile for every product.
The burner controls are split in top and bottom heat and in more zones.
AIR CIRCULATION OVEN-CONVECTION(DIRECT) TYPE
The working principle is indirect air impingement and optimization of the well-known convection principle. The heat from the gas burner is exchanged in the heat exchange above the baking chamber. The baking air is not mixed with the combustion air. Direct Impingement ovens are also available, where combustion air is circulated in the baking chamber.