16" X 20" X 1" 3M Dust and Pollen Filtrete Air Fil

More effective than ordinary fiberglass filters Removes up to 20 times more micro particles Captures irritating & harmful airborne bacteria Removes dust, smoke, bacteria and viruses Two stage filtering material Does not support growth of bacteria or mold No anti-microbial needed Up to 3 months of filtering performance 16x20x1"