In-Line Ceiling Exhaust Fan Discharge Direction Horizontal Duct Diameter Not Applicable Duct Height 4 1/2 in Duct Width 18 1/2 in Duct Shape Rectangular Nameplate Voltage 120V AC Exhaust Airflow @ 0.100 in SP 686 cfm Exhaust Airflow @ 0.250 in SP 644 cfm 656 cfm Noise Level @ 0.100 in SP @ 5 ft 3.8 sones 5 sones Fan Wattage 313 W Frequency 60 Hz Full Load Current 2.9 A Housing Material Steel Motor Output Power 313 W Motor Type Permanent Split Capacitor