General description Filters help maintain the cleaning performance of your Dyson DC19, DC20, DC21, and DC29 vacuum cleaners while reducing the infiltration of dust, pollen, and other allergens into the air you breathe. The 2-in-1 blue Dyson vacuum cleaner filter that fits on the back is made of HEPA, a highly efficient filter paper that can filter 99% of fine particles in the air, ensuring that the air purified by the vacuum cleaner reduces secondary pollution. This filter is perfect for pet owners, featuring Eco-Ready, anti-allergy, and Power filtration functions to keep your home clean. Technical specifications Type: HEPA filter Compatibility: Dyson vacuum cleaners DC19, DC20, DC21, DC29 Usage For best results, it is recommended to replace the filter every 2-3 months to maintain optimal performance.