ITEM SPECIALITY: FLT4825 Air Purifier Hepa Replacement Filter B can capture 99.97% of particles, and can prevent them from being released directly back into the air. FLT4825 hepa filter b used advanced 3 layers of filtration and adds nano fiber filter layer, which has stronger filtration effect on ultra-fine particles below 0.3 microns. For the health of you and your family, we recommend that you replace the FLT4825 Filter B Replacement kit regularly based on your frequency of use, typically 6 months COMPATIBLE MODEL: The premium FLT4825 Filter Replacement is Compatible with ge-rm guardian Models AC4820, AC4825, AC4825E, AC4825DLX, AC4300, AC4300BPTCA, AC4800, AC4850PT, AC4900CA, CDAP4500BCA, CDAP4500WCA, Pure Guardian model AP2200CA, Black&Decker BXAP148. FLT4825 Filter B fit like gloves, so you can make full use of your vacuums. If you are not sure whether your Air Purifier is fit this kit, please