The DWV012 contains two self-cleaning HEPA filters and can be used with or without a collection bag. Bags are for the convenience of the operator, to make it neater and easier to dispose of debris. Shown here with a fleece bag in the tank, the machine also accepts paper collection bags and open-top plastic tank liners.
These filters were nearly buried in plaster dust and yet continued to draw because the self-cleaning mechanism prevented them from clogging. This machine is being used with an open-top plastic liner bag.