The Vevor air purifier replacement filter uses a double-layer 2-in-1 design with an H13 HEPA layer and activated carbon layer to capture fine particles and reduce odors. It is made with non-woven fabric and activated carbon for effective filtration in home environments. The washable pre-filter helps reduce surface dust and hair buildup for easier maintenance. Designed for square purifiers, it is suitable for use in bedrooms, living rooms, nurseries, and offices. Its compact, lightweight design makes installation and replacement simple.