High Efficiency Air Cleaner, Voltage: 120, Hertz: 60, Phase: 1, CFM: 220-300, Amps: 1.2A, Power Consumption: 130W, Quiet Process, No Pressure Drop, Certified 99.97 Filtered 0.3 Microns, Designed To Be Directly Mounted On The Return Air Duct, Or With The Optional Collar Installation Kit S1-HEPACMAKIT(Not Included) For Remote Mounting, Collar Mount Opening: 8" Round, Plenum Mount Opening: 16" X 3.5", Height: 14", Width: 19", In Mfg Box, Made In Canada