Bring cleaner, fresher air into your home with FMUKL AP400 Air Purifier, designed for large living spaces up to 3,390 sq. ft., the AP400 Air Purifier for Large Rooms combines dual airflow with a 3-stage filtration system to help circulate cleaner air throughout your home. This powerful HEPA Air Purifier features washable pre-filters, H13 HEPA filters, and an activated carbon layer to help capture dust, pollen, pet hair, fine airborne particles, and reduce unwanted odors. Ideal as an Air Purifier for Pets, it also features a built-in PM2.5 sensor with a real-time air quality display, along with four convenient modes: ECO, Sleep, Pet, and Auto. The quiet Sleep Mode turns off display lights for a more comfortable nighttime environment, while the washable pre-filter makes routine maintenance easier. Additional features include an essential oil tray, 1–12 hour timer, child lock, four fan speeds, and a filter replacement reminder. For replacement filters, search Walmart item number 19624307967.