- Compatibility: The Upgrade FLT4825 HEPA Filter B Replacement is specifically designed to fit AC4825, AC4300, AC4800, AC4900, AC4850, AP2200CA, and Black+Decker BXAP148 Air Purifiers. It serves as a direct replacement for the FLT4825PT HEPA Filter B. - Advanced 2-in-1 Technology: This filter features an upgraded 2-Stage High Efficiency Filtration System, combining an H13 Grade True HEPA Filter with an Activated Carbon Filter using ARC Formula. This innovation enhances filtration effectiveness, capturing even the smallest airborne particles. - Superior Filtration Performance: Enjoy cleaner air year-round with the Upgrade FLT4825 Replacement Filter. The H13 True HEPA filter captures 99.97% of airborne pollutants as small as 0.03 microns while effectively reducing unpleasant household odors and wildfire gases, ensuring a fresher living environment. - Exceptional Craftsmanship: Our replacement filter utilizes a scientifically tested multi-layer filtration technology, integrating HEPA 13 / MERV 17 non-woven fabric and activated carbon. This meticulous engineering guarantees optimal performance for your air purifier, providing excellent value for your investment. - Cost-Effective Solution: The package includes 4 x 2-in-1 True HEPA Filters and 8 x Activated Carbon Filters. Filter dimensions are H: 15.75 x L: 4.53 x W: 1.18 inches. For best performance, we recommend replacing the FLT4825 filter every 6-8 months. Replacement is simple and tool-free; just remove and install the new filter in your device. - Practical Applications: Ideal for households with pets or allergy sufferers, this filter helps alleviate symptoms caused by dust, pollen, and pet dander. It’s also perfect for urban dwellers concerned about outdoor pollution, providing cleaner air indoors.