Engineered to provide higher initial efficiencies and better overall performance than standard pleated filters. The filter will also provide an Initial Dust Spot Efficiency of 45%, and an Average Dust Spot Efficiency of 55-60% in accordance with ASHRAE Test Standard 52.1. The MERV 11 efficiency ratings provided by the Multi-Pleat XL11 make the filter an excellent upgrade from disposable filters and ordinary pleated filters in applications such as hospitals, laboratories and pharmaceutical plants, commercial office buildings, and in any system in which a higher degree of clean air is required. A medium efficiency extended surface pleated panel filter. Carries a MERV 11 fractional efficiency rating in accordance with ASHRAE Test Standard 52.2.