1.Core 300 Premium Replacement Filter designed for Levoit Core 300, Core 300-P, Core 300S, Core 300S-P, and Core P350 air purifiers. Part number Core 300-RF ensures a seamless fit, while not being compatible with Core Mini, 200S, 400S, or 600S filters. 2.This pet-friendly filter eliminates up to 99.97% of airborne particles as minute as 0.03 microns, effectively neutralizing household odors and smoke residues, keeping your indoor air pristine and refreshing. 3.Effortless Installation - 3 Steps Experience hassle- maintenance with our user-centric Core 300-RF filters. This 3-in-1 H13 True HEPA filter replacement fits Levoit air purifiers with ease, requiring just three simple steps for a smooth installation process. 4.Choice for Air Purification This stands as a reliable partner in air quality improvement, prioritizing your needs in designing these Levoit Core 300 filter replacements. Choose our H13 True HEPA filters for unmatched peace of mind and assurance of cleaner air at home.