The primary pre-filter layer can intercept larger particles in the air, such as hair, dust, and fibers, extending the service life of the subsequent filters. Low-drag airflow design, with optimized spacing between filter pleats, helps maintain smooth air circulation and reduce air volume loss. Regular replacement is recommended according to the usage environment, which helps maintain the filtering effectiveness of the air purification equipment. Simple installation operation: open the machine panel, remove the old filter, and insert the new filter to complete the replacement. Air purifier replacement filter，compatible for Xiaomi，5S, Manufacturer: YLxshop