20x20x5L2M13+C-1 Lennox X7935 Replacement MERV 13 plus Carbon AC Furnace Air Filter 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