16x25x5L1M13+C-1 Lennox X6670 Replacement MERV 13 plus Carbon AC Furnace Air Filter Actual Size of Carbon Air Filter: 15 3/4 X 24 3/4 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