Air Purifier Filter HEPA Replacement Filter B for FLT4825 AC4825, AC4825E AC4825DLX AC4300BPTCA AC4850PT AC4900CA CDAP4500BCA CDAP4500WCA for Guardian Air Purifiers <br><br>Compatible Replacement B filter for models AC4300BPTCA, AC4900CA, AC4825, AC4825DLX, AC4850PT, CDAP4500BCA, CDAP4500WCA, AC4820, for Model AP2200CA and for Black + Decker BXAP148. <br><br>"High-Efficiency Particulate Air" (HEPA) design will capture very fine airborne elements. HEPA filtration is essential for air quality control. <br><br>