- The premium FLT4825 hepa filter b replacement is designed fully compatible with AC4825, AC4300, AC4800, AC4900, AC4850, AP2200CA and BXAP148 Air Purifier to maintain the same effectiveness and efficiency as the original filter to keep your indoor air fresh for a long time. Compared to Part # FLT4825 HEPA Filter B. Using PETOX air purifier filter to ensure what you're buying is worthy of your investment - Enjoy fresh air all-year-round with PETOX FLT4825 HEPA Filter B Replacement for your air purifier to ease uncomfortable symptoms caused by problematic air. The H13 true Hepa filter works alongside the high-efficiency activated carbon filter to take out 99.97% of the airborne particles as small as 0.03 microns and decomposes unpleasant household odors and wildfire gases - Our FLT4825 hepa air filter with h13 true hepa standard adopts advanced lower energy consumption and lower density structure technology verified by the manufacturer, with lower wind resistance, higher efficiency and less pressure to ensure maximum filtration. And the upgraded electrostatic electret filter technology which used in hepa filter ensures energy saving and a longer service life - - Package includes 4 FLT4825 HEPA Filter B and 8 x Activated Carbon Filters. With cost-effective price to save much cost for your all-year-round.