This humidifying air purifier filter replacement is designed for compatibility with the KJ420F-A35 air purifier. It uses a sponge filter with a precision mesh structure to help filter impurities from water while supporting clean, humidified air output. The washable and reusable design helps reduce frequent replacements and makes routine maintenance more convenient. Its compact pleated structure supports smooth airflow and easy tool-free replacement. Suitable for indoor spaces such as rooms, offices, living rooms, kitchens, and studios.