General description Made of HEPA filter paper, this filter kit offers a purification efficiency of up to 99%, ensuring the release of healthier air. It is easy to remove and replace as part of routine maintenance, helping to maintain the cleaning performance of the Dyson DC19, DC20, and DC21 vacuum cleaners while reducing the infiltration of dust, pollen, and other allergens into the air you breathe. Technical specifications Material: HEPA filter paper Purification efficiency: up to 99% Package includes: 2 HEPA filters, 2 washable pre-motor filters, and 2 pre-filters Usage To keep your vacuum cleaner operating at peak performance, it is recommended to replace your filter every 2 to 3 months.