Filter-Monster replacement for GermGuardian Filter Size C Replacement filter compatible with GermGuardian FLT5250 Filter Size C. Engineered to fit GermGuardian AC5250PT, AC5000E, AC5300B, AC5350W, AC5350B, PureGuardian AP2800CA, Black Decker BXAP250 Attached carbon pre-filter reduces household odors from cooking and cleaning and extends the life of filter by capturing larger particles Filtration removes up to 99.97% of airborne particles as small as 0.3 microns in size including smoke, dust, pollen, pet dander, mold spores and dust mites Recommended to replace filters every 6-8 months for optimal performance. Filter-Monster branded replacement filter. Dimensions 20.2 x 5.2 x 2 inches each. Engineered for a tighter fit compatible with GermGuardian Upgraded purple-frame filters. Replacement filter compatible with GermGuardian FLT5250 Filter Size C. Engineered to fit GermGuardian AC5250PT, AC5000E, AC5300B, AC5350W, AC5350B, PureGuardian AP2800CA, Black Decker BXAP250