Tier1 Replacement for White-Rodgers 16x28x6 Merv 11 FR1400-401 Air Filter 2 Pack Upgraded media rated at MERV 11 to capture 90% of particles, 1-3 microns in size Replacement for: White-Rodgers FR1400-401 Superior frame strength utilizing double wall construction and die cut fingers This product is listed and rated by Underwriters Laboratories as U.L. Class 2