Furnace Air Cleaner Filter, Filter Type Pleated, Performance Rating MERV 13, Actual Depth 4 1/4 in, Actual Height 20 in, Actual Width 24 5/8 in, Compatible Grainger Part Number 33R168, 33R194, 33R295, Compatible Manufacturer Model Number F100B1032, F100B1040, F100F1087, F100F1095, F100F2044, F100F2051, F200E1037, Number of Filters 2, Media Material Synthetic, Filter Layer Type Electrostatic, Nominal Depth 5 in, Nominal Height 20 in, Nominal Width 25 in, Filters Down To 0.3 micron