Odor Removal Non-Pleated Air Filter 12x20x1 Nominal Filter Size Style - Air Filters Panel Nominal Height 12 In. Nominal Width 20 In. Nominal Depth 1 In. Air Flow 250 fpm Initial Resistance 0.48 in WC Frame Included Yes Final Resistance 1.00 in WC CCL4 Activity 60 Percent Max Air Flow 500 fpm Prefilter Polyester Max Temp 180 Degrees F