Nispira Premium True HEPA Filter Replacement for GermGuardian FLT4825 Series Air Purifier Filter B for Model AC4825/AC4300/AC4800/AC4900CA/CDAP4500BCA - 2 pk NISPIRA True HEPA filter with carbon pre-filter. Replacement for GermGuardian AC4800 Series Filter B HEPA filter proves to remove household dust, bacteria and germs from air with 99.7% efficiency. Charcoal Pre-filter reduces common odors from pets, smoking and cooking. Replacement filter for GermGuardian Air Purifier Models AC4300BPTCA, AC4900CA, AC4825, AC4850PT, AC4300, AC4800, CDAP4500BCA, PureGuardian Model AP2200CA and Black+Decker BXAP148 Filter dimension 15.5x 4.8 x 1.3 inches. Suggested to replace every 6-8 months 100% satisfaction guaranteed. Premium quality meets or exceeds the leading national brands.