Filter, Filter Type , Performance Rating MERV 17, Actual Depth 9/16 in, Actual Height 17 13/16 in, Actual Width 13 3/8 in, Compatible Grainger Part Number 2HPB2, Compatible Manufacturer Model Number 2HPB2, Number of Filters 1, Nominal Depth 1/2 In., Nominal Height 14 In., Nominal Width 18 In., Filters Down To 0.3 micron, Filters Out , Viruses, Filter Efficiency 99.97 Percent, Frame Material Paper, Includes Frame Yes, Number of Layers 1