Nordic Pure 20x25x4M11+C-1 MERV 11 Plus Carbon AC Furnace Air Filters, Qty 1 Actual size of carbon air filter: 19 1/2 by 24 1/2 by 3 5/8 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