The Flanders High Efficiency MERV 11 Air Cleaner achieves high efficiency at low pressure drop. Our proprietary media combines with AAF Flanders' unique V-pleat manufacturing design to give you the highest performance pleat available on the market today. Available in 3-, 4-, and 5-inch sizes, this deep V-pleated panel filter offers a larger surface area for catching impurities and reducing air resistance. The MERV (Minimum Efficiency Reporting Value) 11 rating means it is third-party certified to effectively reduce common indoor air pollutants such as household dust, pollen, dander and lint, as well as bacteria, virus carriers, and most smoke. MERV ratings provide a standard comparison of air filter performance. A higher MERV rating signifies greater efficiency and increased protection against airborne particles. The high efficiency, synthetic media helps keep your HVAC system clean for more efficient operation which saves you money on both energy consumption and potential equipment repairs. The clay-coated filter frame and wire backing provide durability throughout the filter's life. The Flanders High Efficiency MERV 11 Air Cleaner maintains the minimum listed efficiency throughout the one-year life of the filter. UL Classified.