The containers are fed automatically from an upstream machine or manually using trays. Subsequently, the containers enter the single frame tube into 3 major zones: a) infeed, b) sterilization, c) cooling zone. The sterilization is performed using hot air, which is heated by an electric heating coil and constantly recirculated. Heat resistant high-capacity particle filters guarantee a Class A (100) clean room specification. The filters are mounted without a gasket to minimize the generation of particles. The cooling zone gently cools down the containers before they are automatically transferred to a machine downstream.