The PerfectPleat HC M8 17-3/4x23-1/2x1 air filter by AAF International is a high-performance solution for HVAC systems. Measuring 17-3/4 inches by 23-1/2 inches with a thickness of 1 inch, this filter is designed to fit standard filter slots perfectly. Its M8 rating signifies its ability to effectively trap dust and allergens, enhancing indoor air quality. The pleated design increases the surface area for better airflow and filtration efficiency, while the durable materials ensure long-lasting performance. Ideal for both residential and commercial applications, this filter meets industry standards for reliability.