Product details:

Upgraded media rated at MERV 11 to capture 90% of particles, 1-3 microns in sizeReplacement for: White-Rodgers FR1400M-108 and FR1400M-11198% efficient filter media that captures small dust particles before they can collect on your coilsThis product is listed and rated by Underwriters Laboratories as U.L. Class 2This Tier1 16X25X4 air filter is rated at MERV 11 to capture 90% of particles, 1-3 microns in size.