General description Air Purifier Filter 411 is designed for use with Blue Pure 411, 411+, MINI, and 411 Auto air purifiers. This filter combination includes a particle and carbon replacement filter that effectively absorbs airborne particles, such as pet dander and dirt, improving your indoor air quality. Technical specifications HEPA filter captures 99.97% of airborne particles as small as 0.3 micrometres Material: Plastic Color: White Package Contents: 4 x Air Purifier Filter, 1 x Cleaning Brush Measurement allowed error: +/- 1-3 cm Usage It is recommended to replace the filters every 6 months to ensure optimal performance of your air purifier and maintain fresh air quality.