True HEPA18 Filter Replacement (OCA1200, OCA1210), Filter Type , Compatible Grainger Part Number 780TG9, 780TH0, Compatible Manufacturer Model Number OCA1200, OCA1210, Filter Layer Type Carbon, Nominal Depth 12 in, Nominal Height 12 in, Nominal Width 16 in, Filters Down To 0.3 micron, Filter Efficiency 100 Percent, Frame Material Metal, Includes Dustlock Postfilter, Includes Frame Yes, Media Area 1.78 sq ft, Standards Tested to IEST-RP-CC001.3