The C.B.M. patent n. 01242194 protects their container side filtering system. It is an efficient solution for sterilization procedures. The metallic piece is pressed into one mold. A double gasket is provided for the inner frames. Non-sterile air is collected from the outside, reducing the air volume within during the post-sterilization cooling period. Quick air pressure change could result in load contamination should infected air not pass through the filter system. All air flow is forced through the filter using the gasket system. The difference in filter thickness is compensated by the elasticity of the gasket, so the device can use reusable and disposable filters.