High-Efficiency Replacement Media Filter, 20" x 25"

High-Efficiency Replacement Media Filter Removes Over 97% Of 3. 0-10. 0 Micron Particles From The Air. 20X25" Charged-Media Filter. Minimum Efficiency Reporting Value Merv-13. Efficiency Ranges Are Defined For Small Particles, E1 = 0. 3 To 1. 0 Microns; Medium Particles, E2 = 1. 0 To 3. 0 Microns; and Large Particles, Over 3. 0 Microns. Fractional Efficiency: E1=63%, E2=90%, E3=97%