Our Tier1 14x25x1 Air Filter MERV 11 in a 6-Pack. These folded high-capacity filters are using electrostatically negatively charged filter media from Kimberly-Clark - a recognized leader in the filtration industry. This 100 % polysynthetic bodied significantly higher particulate matter efficiency than regular poly/cotton media folded filters, and captures the smallest and most difficult mobile particles and allergens, such that as particles that carry viruses and bacteria, pollen, mold spores, powdery dust and favorite exfoliation. The combination of high-pitched efficiency and first-class allergen reduction these the idea choice for homeowners looking to improve inside air degree.