Adapted to Fly Philips Air Purifier FY2422 FY2420 AC2889 2887 H13 Filter Element is made of high-quality HEPA filter media that is designed to capture small particles such as dust, pollen, pet dander, and other airborne pollutants. The filter has a high-efficiency rating, with a Minimum Efficiency Reporting Value (MERV) of 13, which means it can capture particles as small as 0.3 microns with an efficiency of up to 99.97%.