PERFECT FIT & COMPATIBILITY: This replacement HEPA filter is designed for AC4221 AC4228 FY4200 air purifier filters, ensuring a tight fit and seamless compatibility to improve the efficiency of your air purifier. ADVANCED MULTI-FILTRATION: With a multi-filtration system, this filter captures 99.97% of particles as small as 0.3 microns, including dust, pollen, and smoke, making it an ideal choice for maintaining a clean and healthy indoor environment. EASY INSTALLATION: This easy-to-install filter simplifies your maintenance work. No tools are required, just replace the old filter every 3-6 months to keep your air purifier performing at its and ensure fresh, clean air. CONSTRUCTION: Made of durable plastic and featuring a high-efficiency HEPA layer, this replacement filter is built to last, maintaining its effectiveness for a long time, providing you with continuous air purification. Its sturdy construction prevents rapid wear and tear, ensuring longevity and continuous performance, and achieving efficient cleaning makes it a reliable choice for daily cleaning. Color: As Shown Material: plastic Package Contents: 2 * Filter