General description The 4Pcs Replacement Filter for Blue Pure 411, 411+, and Mini Air Purifier features a powerful H13 grade 2-IN-1 True HEPA filter that effectively captures airborne particles and allergens, making it ideal for households with pets and for improving asthma and allergies. The filter fibers are naturally antibacterial, ensuring that you receive only fresh air. Technical specifications Material: Composite material Color: White Package Contents: 4 x Air Purifier Filters Measurement allowed error: +/- 1-3 cm Usage For optimal performance, it is recommended to replace the filters every 6 months. The particle filter removes dust, pet dander, common pollutants, and fabric fibers, while the activated carbon layer traps light household odors, smoke, chemicals, and volatile organic compounds (VOCs).