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
Standard/Approvals: Air-Conditioning Engineers Standard 52.2-1999
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