Pre-Filter, Filter Type Panel/Rigid Cell, Performance Rating MERV 17, Actual Depth 1 in, Actual Height 16 in, Actual Width 16 in, Compatible Grainger Part Number 4AYF5, Compatible Manufacturer Model Number F270, F271, Number of Filters 4, Nominal Depth 1 in, Nominal Height 16 in, Nominal Width 16 in, Filters Down To 0.3 micron, Filters Out Dust, Smoke, Viruses, Filter Efficiency 95 Percent, Air Flow @ 300 fpm 533 cfm, Frame Material Cardboard, Includes Not Applicable