20x25x5L1M15+C-1 Lennox X6673 Replacement MERV 15 plus Carbon AC Furnace Air Filter Actual Size of Carbon Air Filter: 19 7/8 x 24 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