Item Type: Air Purifier Filter Material: PP, PET. Package List 2 x Filter Element 2 x Filter Cotton You should change the filter at least every six months, and more often in households with children, animals, or smokers. 1Good Filtering: The filter element works effectively in filtering out particles up to 0.3 microns, easy and reliable. 2More Enjoyment: Excellent filtering effects can build you a cleaner living environment with enjoyment and refreshment. 3Reliable Works: Low in resistance and large in dust holding capacity, the air purifier filter enables high efficiency. 4Ideal Matching: Standard design suits for AC5000, AC5000E, AC5250PT, AC5350B, AC5350BCA, AC5350W, AC5300B, AP2800CA. 5Easy to Install: Comes with a light weight and a compact size, the simple installation will simplify the replacement.