The WOLF VAC 1 is equipped with a conical pre-filter and one H13 HEPA filter. The main filter with 1.7m² filter surface, each of the HEPA filter is independently tested and certified. This Vac 1 can separate the fine dust with efficiency 99.99% ensuring your work space is a clean and safe environment. The Vac 1 is recommended for small grinders and hand held power tools.