Tier1 Replacement for Bryant 16x20x4-1/4 Merv 11 FILBBFNC0017 Air Filter 2 Pack Upgraded media rated at MERV 11 to capture 90% of particles, 1-3 microns in size Replacement for: Bryant FILBBFNC0017 and Carrier FILCCFNC0017 Original box type design This product is listed and rated by Underwriters Laboratories as U.L. Class 2