Honeywell FC100A1011 (5-Pack) - 20" x 20" x 4" Pleated Air Filter, MERV 11

Features 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.Product Specifications Application - Replacement Filter Dimensions (in.) - 20 in. x 20 in. Dimensions (mm) - 508 mm x 508 mm Used With - Honeywell 20X20 F100 and F200 Media Air Cleaners Type of Air Cleaner - Media Air Cleaner Efficiency Standard - 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 part 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