General description These HEPA filters are designed specifically for the Mi Air Purifier 4, ensuring high-quality air purification. Made from composite materials, they effectively filter fine dust, pollen, and other allergens, improving the air quality in your home. Technical specifications Material: Composite materials Color: Green Package Contents: 1 x HEPA filter Measurement allowed error: +/- 1-3 cm Usage Replace the HEPA filter every 2 to 3 months for optimal performance. Easy to remove and replace as part of normal maintenance.