Air Cleaner Filter Performance Rating MERV 6 Actual Depth 1 in Actual Height 8 in Actual Width 27 in Compatible Grainger Part Number 4GJR4 Compatible Manufacturer Model Number S-985-1 Number of Filters 6 Media Material Polyester Filter Layer Type 2-Ply Polyester Nominal Depth 1 in Nominal Height 8 in Nominal Width 27 in Filters Down To 3 micron Filters Out Dust Mold Filter Efficiency 50 Percent Includes Polyester Pre-Filter Includes Frame No Media Area 1.5 sq ft