Commercial-grade pleated filters available in 1″, 2″, and 4″ sizes. Built with polyester and polypropylene electret media that repels moisture and resists supporting bacterial or mold growth. Double-wall frame construction provides durability in high-demand applications. Rated MERV 10 at 492 fpm for medium-efficiency filtration. Designed with increased pleat density, providing up to 40 percent more pleats for greater dust-holding capacity with lower resistance. UL listed. Dimensions shown are nominal. Actual sizes are slightly smaller. Standard and custom sizes are available. Sold in cases of 12 each for 1″ and 2″ filters, and 6 each for 4″ filters.