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The HEPA (High Efficiency Particulate Air) filter can be installed in addition to the standard filter to improve the filtration. By adding this filter you will get a triple filtration: 1. Fleece dust bag 2. Standard main filter 3. HEPA filter.Please note that adding this filter will not make a dust extractor DE 1230 an H-class extractor, even though the filter itself fulfills HEPA class H13 requirements.