Designed, developed, and patented by AAF, the PerfectPleat ULTRA is a product with form and fit unlike any other pleated filter in the marketplace today. The automated and controlled process AAF has developed for the PerfectPleat eliminates inconsistencies and irregularities in order to provide the filtering efficiency you need and expect. The PerfectPleat ULTRA filters deliver the highest efficiency available in the PerfectPleat family, with a MERV 8. The filters also come with an antimicrobial treatment, providing a filter ideal for today's IAQ conscience applications.