The Orange/White media has a Merv rating of 8. Antimicrobial effectively controls growth of mold, mildew,algae, and fungi on media. The multi density media is designed for depth loading. The coarse white layer captures the larger more visible dust. The Orange, dense downstream layer prevents finer dirt from passing through the media. Tackifier enhances dust retention and assures a high percent of air-borne contaminant removal. Fibers are randomly laid in all directions offering more cross-over points for dirt to be trapped. It will eliminate 90-95% of dust particles. There are 2 standard widths 20″ and 25″. If you are in need of a custom width just email or call.