Mini-Pleat Air Filter Style - Air Filters Box Performance Rating MERV 11 Nominal Filter Size 18x24x4 Filter Efficiency - Air Filters 60 Percent to 65 Percent Media Material Fiberglass Frame or Header Material Beverage Board Air Filter Header Type No Header Gasket Location None Gasket Material None Media Color White Media Separator Construction Glue Filters Out Auto Emission Particulates Coal Dust Humidifier Dust Lead Dust MERV 9-12 Legionella Milled Flour Nebulizer Droplets