Furnace Air Cleaner Filter, Filter Type Pleated, Performance Rating MERV 11, Actual Depth 6 in, Actual Height 27 1/8 in, Actual Width 16 in, Compatible Manufacturer Model Number 401, Number of Filters 2, Media Material Synthetic, Filter Layer Type Electrostatic, Nominal Depth 6 in, Nominal Height 28 in, Nominal Width 16 in, Filters Down To 0.3 micron, Filters Out Auto Emission Particulates, Dust, Filter Efficiency 65 Percent, Air Flow @ 300 fpm 1,024 cfm, Frame Material Cardboard