The CBM patent number 01242194 is an effective and unique solution when it comes to protecting a filtering system and sterilization. The inner frames are made with a double gasket and pressed in one mould on the metallic design. It’s an established fact that during the cooling process after sterilization, the air volume inside a container begins to decrease and non-sterilize air is drawn in from the outside. This flow, which also occurs due to a sudden change in pressure, may contaminate the load. It is therefore essential that infected air only passes through the filter. This gasket is designed to force possible flows of infected air from the outside to pass through the filter. On top of that, the elasticity permits the use of reusable and disposable filters for a single container. This is because it compensates for the differences in thickness of both types of filters.