Nordic Pure 20x20x5L1M11+C-2 Lennox X0585 Replacement MERV 11 Plus Carbon, Qty 2 Actual size of carbon air filter: 19 5/8by 19 7/8 by 4 3/8 One convenient air filter - MERV 11 pleated plus activated carbon Odor absorbing activated carbon A simple solution for controlling both odors and dust particles Nordic Pure Manufacturer Direct since 1960 - Made in the USA