Honeywell FC100A1003 16" X 20" Media Air Filter, MERV 11
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New MERV 10 (at 492 FPM) performance with lower pressure drop at no additional cost!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