Washable Metal Air Filter, Rectangular, Media Material Not Applicable, Air Filter Construction Mesh, Frame or Header Material Aluminum, For Use With (Systems) 3412, Media Area 1.75 sq ft, Filters Out Dirt, Dust, Initial Resistance @ 300 fpm Not Applicable, Nominal Height 16 in, Nominal Width 20 in, Nominal Depth 2 in, Actual Height 15 5/8 in, Actual Width 19 5/8 in, Actual Depth 1 7/8 in, Standards UL Class 2