Mini-Pleat Air Filter Style - Air Filters Box Performance Rating MERV 11 Nominal Filter Size 20x20x4 Filter Efficiency - Air Filters 65 Percent Media Material Synthetic Frame or Header Material Plastic Air Filter Header Type No Header Gasket Location None Gasket Material None Media Color White Media Separator Construction Glue Filters Out MERV 9-12 Legionella Humidifier Dust Lead Dust Coal Dust Milled Flour Auto Emission Particulates Nebulizer Droplets