Tier1 Replacement for 20x25x2 Merv 8 Pleated Dust & Pollen AC Furnace Air Filter 6 Pack 30 times more efficient than ordinary fiberglass filters at capturing the smallest, most troublesome particles (3-10 microns in size) Doesn't promote the growth of bacteria, mold, mildew, or fungi so they're a great choice for families with small children Similar to the 3M Filtrete Dust & Pollen filter Automated manufacturing, versus manual assembly, ensures consistent construction