Nordic Pure 20x24x2 MERV 13 Pleated AC Furnace Air Filters Plus Carbon, Box of 3 Actual Size of Carbon Air Filter: 19 3/8 x 23 3/8 x 13/4 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