Activated Carbon Air Filter, 18x20x1

Activated Carbon Air Filter, Nominal Height 18 In., Nominal Width 20 In., Nominal Depth 1 In., CCL4 Activity 0.6, Air Flow 250 fpm, Initial Resistance 0.48 In. WC, Final Resistance 1.00 In. WC, Max. Air Flow 500 fpm, Prefilter Polyester, Max. Temp. 180 Degrees F. Only shipped in quantities of 12.