Nordic Pure 20x20x5L1M13+C-1 Lennox X0585 Replacement MERV 13 Plus Carbon AC Furnace Air Filters, Qty-1 Actual Size of Carbon Air Filter: 19 5/8x 19 7/8 x 4 3/8 Odor absorbing activated carbon One convenient air filter-MERV 12 pleated plus activated carbon A simple solution for controlling both odors and dust particles Nordic Pure Manufacturer Direct Since 1960-Made in the USA