The prefilter from HERR is a high-density metal filter membrane that pre-filters many types of dust. The system can be configured to pre-process different exhaust and dust types with different features. The MR prefilter uses a metal mesh, a metal filter membrane, a polyester filter membrane and a fine filter element or an activated carbon filter. Other customizable filters are available. The system has a differential pressure indicator, an alarm function and maintenance instructions, which can be used depending on the specific type of filtration. The filter construction has a large maintenance door to ensure that the service is simple and convenient. The bottom has forklift handles, which allow easy positioning and easy transportation of the facility.