TrueCLEAN™ enhanced air cleaner for use in return air ducts of forced air systems provides high-filtration performance while destroying contaminants, treating air stream through three-step process: charge, capture, and destroy. Duct mounted. Dimensions:16 x 20 inch (406x508mm); airflow capacity (Cubic Feet/Minute-CFM): maximum- 1350 CFM; airflow capacity (Cubic Meters/Hour-m³/hr.): maximum--3000 m³/hr.; Minimum Efficiency Reporting Value (MERV)-15. 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, over 3.0 microns. Fractional efficiency: E1=90%, E2=96%, E3=99%. Replacement filters: FR8000A1620. Frequency: 60 Hz.