US Home Filter AC40-20x22x1-6 20x22x1 Activated Carbon Odor Removal Merv 8 Pleated Air Filter (6-Pack), 20" x 22" x 1" Actual size: 19-1/2 inch x 21-1/2 inch x 3/4 inch Controls odor and dust at the same time Relief from tobacco smoke, pet odors, musty smells, and more Made with nano particle Activated carbon to absorb odor Low airflow resistance for better equipment operation and to help lower energy costs