AirCobra" Self-sealing link and panel filters, available in 4-ply (MERV 11), 3-ply (MERV 10), and 2-ply (MERV8) designs. Layers of moisture resistant polyester media are sealed around the entire perimeter of the filter, and at various points on the face, to bond the wire frame inside the layers of media. Self-sealing design provides fast and easy installation requiring no clips or latches.