Nordic Pure 18x20x1M8+C-12 MERV 8 Plus Carbon AC Furnace Air Filters, Qty 12 Actual size of carbon air filter: 17 1/2 by 19 1/2 by 3/4 Odor absorbing activated carbon One convenient air filter-MERV 8 pleated plus activated carbon A simple solution for controlling both odors and dust particles Nordic Pure Manufacturer Direct Since 1960 - Made in the USA