This is a kind of device that helps to reduce in a short time core temperature in the cold room in where operates without damaging the product and without losing its freshness.The name of the process is shocking. Compressors which are used in shock devices are used with dual-stage, semi-hermetic and screw compressors. The issues to be most noticeable in the shock unit is routers. Evaporator doesnot blow air to product directly, blow to router directly. This process helps maintain the freshness of the product. There are two types of shock units as  straps and ground-mounted.