- The FLT4825 HEPA Filter B Replacement Set is specifically designed for compatibility with AC4825, AC4300, AC4800, AC4900, AC4850, AP2200CA, and Black+Decker BXAP148 air purifiers. This set serves as a direct replacement for the FLT4825 HEPA Filter B. Please note that this is not an OEM product; brand names and model designations are used solely for compatibility reference. - Experience superior air quality with our upgraded FLT4825 replacement filter, featuring advanced multi-layer filtration technology. Rigorously tested in independent laboratories, it combines HEPA 13 / MERV 17 non-woven fabric with activated carbon, ensuring optimal performance and value for your air purifier investment. - Breathe easier year-round and alleviate discomfort from poor air quality with the FLT4825 replacement filter. The H13 True HEPA filter works in conjunction with a high-efficiency activated carbon filter to capture 99.97% of airborne particles as small as 0.03 microns. It effectively neutralizes unpleasant household odors and wildfire gases, maintaining a fresh living environment. - Each package includes 4 H13 True HEPA filters and 8 activated carbon filters. Dimensions for the HEPA filter are 15-7/10 inches in height, 4-1/2 inches in length, and 1-3/10 inches in width. The activated carbon filter measures 15-7/10 inches in height, 4-1/2 inches in length, and 1/5 inch in width. - For optimal performance, we recommend replacing the HEPA filter every 6-8 months and the pre-filter every 2-3 months. The replacement process is straightforward and requires no tools—simply remove the old filter and install the new one as needed. - Ideal for households with allergies, pets, or smoke exposure, this filter set enhances air quality in bedrooms, living rooms, or any space where clean air is essential for comfort and well-being.