25%-50% Average Efficiency FilterAirCobra" AAF new high-efficiency, panel and self-sealing link filters, available in MERV 11 (4-Ply), MERV 10 (3-Ply) and MERV 8 (2-Ply). The AirCobra" is posed to strike at the airborne particulate in highly humid climates and environments. Every AirCobra filter incorporates SAAF-tac(patent pending), AAF's environmentally-safe filter adhesive. Average efficiencies: 25%-30% (2ply), 35%-40% (3ply) and 45%-50% (4ply).