The 2-Pack HEPA Filter for GermGuardian FLT4825 Purifier is designed to fit the AC4825, AC4825E, and AC4850PT models, providing true HEPA filtration technology to improve indoor air quality. The black and white filters have a filter life of 4 months and come in a pack of 2. Made with a plastic filter frame and paper filter media, these pleated filters are compatible with Black & Decker BXAP148 and PureGuardian AP2200CA air purifiers, offering a solution for maintaining clean air in your home for an extended period of time.