American Air Filters PerfectPleat HC M8 filters are designed with a MERV 8 rating initially but increase efficiency when dust loading begins. Using DuraFlex media made from uniform size virgin fibers, the pleated panels are self-supporting. with 25% more media than American Air Filter standard capacity filters, the American Air Filters PerfectPleat HC M8 filter is ideal when higher performance is required. As an environmentally friendly product, the PerfectPleat HC M8 filters do not require wire for support, making them completely incinerable.