Tier1 Replacement for White-Rodgers 16x26x5 Merv 13 F825-0548 Air Filter 2 Pack Upgraded media rated at MERV 13 to capture 90% of particles, 1 microns or smaller in size Replacement for: White-Rodgers F825-0548 and FR1400-100 Filter can also be used as a replacement filter for White-Rodgers electric air cleaner series SST14/SST1400 collection cell A811-0939/F811-0397 (Power must be disconnected when using a filter in place of a collection cell) This product is listed and rated by Underwriters Laboratories as U.L. Class 2