When placed on container sides, this protected filtering system is an efficient solution when it comes to sterilization requirements. The CBM patent number 01242194 offers technology to protect the insides of containers from non-sterile air. A double gasket is provided with the inner frames, which are pressed in a single mould on the metallic container. The gasket has an elastic and flexible design that allows for the use of disposable and reusable filters in the same container. It also forces possible flows of non-sterile air from the outside to enter the container through the filter during the cool down process. After sterilization, the volume of air inside of the containers decreases. This causes air from the outside to be called in. If it doesn’t pass through a filter, there is the possibility of contamination. This gasket technology ensures that it does pass through the filter.