Air Filter, Filter Type Paper, Performance Rating MERV 8, Actual Depth 1 in, Actual Height 25 in, Actual Width 16 in, Compatible Grainger Part Number 45J424, Compatible Manufacturer Model Number 64657, Number of Filters 1, Filter Layer Type Paper, Nominal Depth 1 in, Nominal Height 25 in, Nominal Width 16 in, Filters Down To 1 micron, Filters Out Dust, Standards UL Listed.