- Compatibility and origin: Designed for use with AC4825, AC4825E, AC4300, AC4800, AC4900, AC4850, AP2200CA. This is not an original manufacturer product; it is designed specifically for compatibility with these models. - What it does: The FLT4825 Replacement Filter combines a H13 true HEPA filter with a high-efficiency activated carbon filter to capture airborne particles as small as 0.3 microns and to decompose odors and wildfire gases. It helps reduce symptoms caused by problematic air and supports improved indoor air quality. - What’s included: 4 x H13 True HEPA Filter and 10 x Activated Carbon Filter. - Replacement guidance: For optimal performance, replace the HEPA filter every 6-8 months and the pre-filter every 2-3 months. - Easy installation: No tools required. Remove the old filter and insert the new one. After installation, turn on the purifier and press the UV button for 5 seconds until the flashing red light disappears, indicating the filter has been reset. - Use scenarios: In a living room or bedroom to maintain fresh air all day; in an office to reduce particulate matter and odors; during wildfire season or in homes with pets to improve overall air quality.