Purolator® Key Pleat® is a standard-capacity, self-supported (SSP) air filter that is suitable for use in HVAC or process air applications with medium dust-holding requirements. The filter achieves MERV 8 mechanical efficiency and can save users time and money previously wasted on replacing damaged wire-backed filters. With no metal that can warp or deform, moisture-resistant beverage board frame, and rugged synthetic media, the Key Pleat® maintains its structural integrity even in wet or humid conditions. Available in 1- and 2-in depths.