General description For 4 Pro Hepa Filter for Mi Air Purifier Pro-A is designed to enhance air quality by filtering fine dust, pollen, and other allergens, ensuring cleaner air for you to breathe. Made from high-quality composite materials, this filter is essential for maintaining optimal performance of your air purifier. Technical specifications Material: Composite materials Color: A-Blue Package Contents: 1 x HEPA filter Measurement allowed error: +/- 1-3 cm Installation Easy to remove and replace as part of normal maintenance. Usage It is recommended to replace the filter every 2 to 3 months for best performance.