The PerfectPleat HC M8 21-1/2+28-1/2+2 from AAF International is a high-performance air filter designed for efficient filtration in HVAC systems. With dimensions of 21-1/2 inches by 28-1/2 inches, this pleated filter enhances airflow while effectively trapping dust and allergens. The M8 efficiency rating indicates its capability to significantly improve indoor air quality, making it suitable for both residential and commercial applications. Made from high-quality materials, this filter is built for durability and long-term use. It complies with industry standards, ensuring reliable performance. The PerfectPleat HC M8 is compatible with a variety of HVAC systems, making it an excellent choice for maintaining a clean and healthy indoor environment.