Product details:

Upgraded media rated at MERV 13 to capture 90% of particles, 1 microns or smaller in sizeReplacement for: GeneralAire 14201, 5FM2025, 4501, Trion / Air Bear 255649-102, 259112-102, 259112-105, 229990-102 and 248713-102General has started rounding the dimensions on their 5-inch filters. These filters still fit the same, they just no longer contain fractions in the descriptionThis product is listed and rated by Underwriters Laboratories as U.L. Class 2This Tier1 20X25X5 air filter is rated at MERV 13 to capture 90% of particles, 1 microns or smaller in size. Replacement for: GeneralAire 14201, 5FM2025, 4501, Trion / Air Bear 255649-102, 259112-102, 259112-105, 229990-102 and 248713-102,