Tier1 Replacement for Trane 21x26x5 Merv 11 AC Furnace Air Filter 2 Pack Captures 90% of harmful airborne particles such as dus, pollen, pet dander, mold spores, smog, & more Comparable Filter Replacement For: Trane BAYFTAH26M, FLR06074 Actual Size: 20.1 inches (length) x 25.7 inches (width) x 5 inches (thickness) Original box type design Recommend filter life of 3 months to reduce damage to your furnace / ac unit