Honeywell Home 16" X 20" Media Air Filter

New MERV 11 (at 492 FPM) performance with lower pressure drop at no additional cost. Specifications Application: Replacement Filter Efficiency Standard: Efficiency ratings are based on American Society of Heating, Refrigerating and Air-Conditioning Engineers Standard 52.2-1999. Efficiency Standard: 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, E3=3.0 to 10.0 microns. Fractional Efficiency: E1=25%, E2=62%, E3=85% Minimum Efficiency Reporting Value (Media Filters Only): MERV 11 Static Pressure Drop (in. w.c.): 0.23 at 500 FPM Nominal Size: 16" x 20" x 4" Actual Size: 15-7/8" (15.875") x 19-7/8" (19.875") x 4 3/8" (4.375") Features Efficiency ratings are based on American Society of Heating, Refrigerating and Air-Conditioning Engineers Standard 52.2 1999. 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, E3=3.0 to 10.0 microns.