Honeywell FC100A1037-5 20" x 25" x 5" Merv 11 Filter Media (Pack of 5)
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20X25 Media Air Filter-MERV 10Efficiency 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
Efficiency ratings are based on American Society of Heating, Refrigerating and Air-Conditioning Engineers Standard 52.2 1999