Perfect Fit and Compatibility FLT5250PT air filter C is compatible with AC5250PT air purifier models AC5000E, AC5350W, AC5000, AC5300B, IAP-GG-125, and BXAP250. They work as the original filters that come with the cleaner. Premium Filtration Filter size C FLT5250PT uses high-grade H13 true HEPA material to capture particles as small as 0.3 microns, helping improve sleep quality and overall air quality. Easy to Install and Maintain No tools required. To keep your unit performing well, replace the True HEPA filter every 6 months and the activated charcoal pre-filter every 3 months. Cost-Effective Package FLT5250PT filter-c-pet combo contains 2x H13 HEPA Filters and Extra 6x Carbon Pre-filters. By choosing our product you get OEM-like performance at a lower cost for all-year round air cleaning needs. Practical use scenarios - In the bedroom to reduce allergens and improve sleep comfort. - In homes with pets to cut down on pet dander and odors. - In small offices or workspaces to maintain a cleaner, fresher environment.