Carmerny Core 400S H13 True HEPA Replacement Filter Compatible with LEVOIT Core 400S Smart WiFi Air Cleaner Purifier, Core 400S-RF-PA (LRF-C401-YUS), 3-in-1 Activated Carbon Pre-Filter 2 Pack, WhiteCOMPATIBILITY Our Core 400s RF PA replacement filter is compatible with LEVOIT Core 400S Smart WiFi Air Cleaner Purifier. Compared to Part #Core 400S RF, LRF C401S WUS. 3 STAGE FILTRATION Our Core 400S filter is designed in H13 True HEPA Filter, high efficiency activated carbon, and fine Nylon Pre Filter that helps to filters 99. 97% airborne particles down to 0. 3 microns and neutralize odors, cooking, and wildfire smoke, and VOCs, improved air