Nispira True HEPA Filter B FLT4825 Replacement Compatible with GermGuardian Air Purifier AC4825 AC4825E AC4825DL AC4825DLX AC4300BPTCA AC4850PT AC4900CA CDAP4500BCA CDAP4500WCA, AC4300bptca, AC4900ca, AC4825, AC4825dlx, AC4850PT, CDAP4500BCA, CDAP4500WCA, AC4820, Pure Guardian model AP2200CA, Black Decker BXAP148, 1 Pack