Compatible with AC4825, AC4300, AC4800, AC4900, AC4850, AP2200CA and Black+Decker BXAP148 air purifiers. Replacement for FLT4825PT HEPA Filter B. Upgraded 2-in-1 technology. The second upgraded version uses a 2-Stage High Efficiency Filtration System: (1) H13 True HEPA Filter and (2) Activated Carbon Filter with ARC Formula. This design provides higher filtration efficiency and capacity. Excellent filtration. The H13 True HEPA filter captures 99.97% of particles as small as 0.03 microns. The activated carbon filter helps remove odors and wildfire-related gases, improving overall air quality. Superior construction. Multi-layer filtration combines HEPA 13 / MERV 17 non-woven fabric with activated carbon through careful engineering. Independent laboratory testing supports performance claims. Contents and specs. Package includes 4 x 2-in-1 True HEPA Filters and 8 x Activated Carbon Filters. Filter dimensions: H: 15.75 x L: 4.53 x W: 1.18 inches. Replace FLT4825 filter every 6-8 months for optimal performance. Easy to replace with no tools required. Use scenarios. Ideal for allergy relief in bedrooms or living rooms, for cleaner air during wildfire season, and in small offices or apartments where improved air quality is needed.