The Helios ELF-AirPal 1750+900/ePM1 80% (F9) air filter is a high-performance replacement filter designed for the AirPal 1750 H and AirPal 900 U air purifiers. With an ePM1 80% filtration class (F9), this filter effectively removes fine particles, allergens, and other pollutants, ensuring clean and healthy air. Ideal for use in both residential and commercial spaces, this filter provides superior filtration and enhances the performance of your air purifier. Easy to install and long-lasting, the ePM1 80% filter ensures that your AirPal air purifiers continue to deliver optimal air quality.