Nordic Pure 20x25x5HM13+C-1 Honeywell Replacement MERV 13 Plus Carbon AC Furnace Air Filter Actual Size of Carbon Air Filter: 19 7/8 x 24 7/8 x 4 3/8 Activated charcoal flat panel added to increase odor control Removes tobacco and fireplace smoke, along with all contaminants removed by a MERV 12 filter Ideal for customers looking for superior filtration but needing an odor control element Made in the USA