Product details:

HEPA Filter, 12x12x6 Nominal Filter Size, Nominal Height 12 in, Nominal Width 12 in, Nominal Depth 6 in, For Use With Mfr. No. 987-UCA1, Frame Included Yes, Filter Efficiency 99.97 Percent, Media Area 29 sq ft, Standards UL Listed, Filter Rating (Microns) 0.3