The PerfectPleat HC M8 21-1/2+36-1/2+2 by AAF International is a premium air filter designed for high-efficiency filtration in HVAC applications. Measuring 21-1/2 inches by 36-1/2 inches, this filter features a pleated design that optimizes airflow while effectively capturing airborne particles. With an M8 efficiency rating, it is capable of filtering out a wide range of contaminants, making it ideal for both residential and commercial use. Constructed from durable materials, this filter ensures long-lasting performance and reliability. It meets industry standards for air quality, providing assurance of its effectiveness. The PerfectPleat HC M8 is compatible with various HVAC systems, making it a practical choice for maintaining clean air in any environment.