Value Pack: This cost-effective pack includes 4 carbon pre-filters, offering the same reliable performance as the original filters. Perfect Compatibility: These air filters replace for FLT4825 are designed to fit AC4825E, AC4850PT, AC4300BPTCA, AC4900CA, AC4825DLX, CDAP4500BCA, and CDAP4500WCA air purifiers, replaces part# FLT4825, FLT4850PT, and Filter B Filter: Effectively captures dust, pollen, pet dander, and allergens as small as 0.1 microns from the air Activated Carbon Pre-filter: Removes unpleasant odors from pets, smoke, cooking fumes, and household products Easy Installation: Simply remove the old filters and replace them with the new ones for quick and convenient setup