Feature:1. PERFECT COMPATIBLE: Ideal for FLT4825 b air purifier replacement filter, compatible with CDAP4500BCA CDAP4500WCA AC4900 AC4850pt AC4300wpt AC4300 AC4900ca AC4825 replacement filter, comparable to the original2. EXCELLENT PERFORMANCE: Filter size b FLT4850PT uses premium H13 for true high efficiency particulate arrestment3. WORTH PACKAGE: Combo includes extra 2 pre filters and 2 H13 true high efficiency particulate arrestment filters. You get all the advantages of an original air filter and save a lot for your year round air purification needs4. EASY TO INSTALL: No tools required, in order for your air purifier to work properly, which is a good replacement5. EXCELLENT COTTON: Adopt excellent cotton material, which is porous, hygroscopic, heat resistant, you can use with confidenceSpecification:Item Type: High Efficiency Particulate Air Filter ElementMaterial: High efficiency particulate arrestment, cotton.Package List:2 x Filter(with pre filter)1 x User ManualNote:It is recommended to replace the filter every 6 months for best performance.