1.Perfectly compatible with AC4825, AC4825E, AC4300, AC4800, AC4900, AC4850, AP2200CA , Please note that this is not an original manufacturer product, but it is designed specifically for compatibility with the listed models. 2.Enjoy fresh, clean air all year round with the FLT4825 Replacement Filter. This H13 true HEPA filter, combined with a high-efficiency activated carbon filter, effectively filters airborne particles as small as 0.3 microns, It also decomposes unpleasant household odors and wildfire gases, keeping your living environment fresh and comfortable. Designed to ease uncomfortable symptoms caused by problematic air, this filter is a must-have for anyone looking to improve their indoor air quality. 3.Package includes 4 x H13 True HEPA Filter and 10 x Activated Carbon Filter. Maintaining optimal air quality in your home or office is crucial for your and well-being. That's why it's essential to replace the filters in your air purifier regularly. We recommend replacing the HEPA filter every 6-8 months and the pre-filter every 2-3 months for optimal performance 4.Replacing the filter in your machine is a straightforward process that doesn't require any tools. Simply re-move the old filter and insert the one into the unit. Once installed, turn on the machine and press the UV button for 5 seconds until the flashing red light disappears, indicating that the filter has been successfully reset.