1.True Stack Filter: Air Purifier Filter Replacement Compatible with , captures up to 99.97% of particles as small as 0.3 microns that pass through the filter 2.The recommended air purifier filter renewal cycle is 3-6 months. Regular filter replacement ensures maximum effectiveness of the purifier 3.Effectively reduces gases and odors in the air that passes through the filter, perfect for anyone who wants to improve air quality Compatible with: Spot adaptable Air Purifier filter Applicable models: Model: AC2887 AC2889 C2882 AC2878 C3824 AC3822 Consumable model Color: As shown Material: HEPA+ Activated Carbon Package Contents: 2 Pc HEPA filter FY2422 2 Pc Activated carbon filter FY2420 Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.