Made of HEPA filter paper, the purification efficiency up to 99%, the air is healthier. They are easy to remove and compatible as part of routine maintenance. The filters help maintain the cleaning percompatiblemance of the DYSON DC19 DC20 DC21 DC29 vacuum cleaner, while reducing the infiltration of dust, pollen and other allergens present in the air you breathe. To keep your vacuum running at peak percompatiblemance, please compatible your filter every 2-3 months. Package: 1 x Washable HEPA Filter compatible Dyson DC19 DC20 DC21 DC29; 1 prefilter compatible Dyson DC19 DC20 DC21 DC29. How to clean the filter: 1. Remove the bin by pressing the release button. - Open the bin door to empty it. 3. Squeeze and lift the filter or release tab. 4. Remove the filter by grasping the yellow tab. 5. Tap the filter against the dustbin. 6. To reinstall the filter, press the metal filter lever, with the side of the filter and push the filter down, the filter door will not close if the filter is not installed correctly. Specifications: Item Type: Vacuum Cleaner Parts. Material: HEPA filter paper + plastic. Diameter: 152mm approx. Main functions: Filters dust. Compatibility: Compatible with Dyson DC19, DC20, DC21, DC29 vacuum cleaner. Contents: 1 HEPA filter and 1 pre-filter.