Widely Baking Scope. Shanghai High and New Technology Company gained by this tunnel oven. 300 mm temperature keeping layer. Specificationsautomatic bread production line electric tunnel oven 1. Fuel : electricity or gas. 2. Baking scope: pie, cake, hamburger, toaautomatic bread production line electric tunnel oven 1. Fuel : electricity or gas. 2. Baking scope: pie, cake, hamburger, toaautomatic ...