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The tunnel freezer is a cryogenic freezing system prevalent in the food industry. In short, a tunnel freezer is a long cryogenic tunnel that is used to cool food products very quickly. The products enter the tunnel hot or at room temperature at one end and come out frozen at the other end.

Cooling tunnels ensure controlled temperature reduction in both batch and continuous process systems. They are similar to air convection ovens, but have no heating capacity. Cooling tunnels use blowers to force ambient air or outside air into the tunnel while drawing heated air from the parts out the opposite end.
They're commonly used in the bakery industry and the production of processed foods. Cryogenic. In a cryogenic tunnel freezer, foods are frozen using cryogenic gases such as liquid nitrogen or liquid carbon dioxide. This type of tunnel is fit for freezing delicate foods like fruits and vegetables.

The principle of the freezing tunnel is based on a circulation of air at a very high speed and at a temperature of the order of -35℃. It will allow a rapid lowering of the temperature of the product to stabilize it around -18℃/-20℃ at heart.