Tier1 Replacement for Skuttle 20x20x5 Merv 11#000-0448-003 Air Filter 2 Pack Upgraded media rated at MERV 11 to capture 90% of particles, 1-3 microns in size Replacement for: Skuttle #000-0448-003, Trion / Air Bear 255649-103, 229990-103, 259112-103, Trion 248713-104, 455604-001, 455604-019, Quality Filters SBTRAB2040 and SBTRAB20MQP 98% efficient filter media that captures small dust particles before they can collect on your coils This product is listed and rated by Underwriters Laboratories as U.L. Class 2