Broan Flex Series 80 CFM 0.8 Sones Ventilation FanBathroom Exhaust Fan Discharge Direction Horizontal and Vertical Duct Diameter 4 in Duct Shape Round Housing Material Steel Heater Without Heater Includes Ezduct Connector Foldaway Mounting Ears Mounting Location Ceiling Exhaust Airflow @ 0. 100 in SP 80 cfm Maximum Noise Level 0. 7 sones Noise Level @ 0. 100 in SP @ 5 ft 0. 7 sones Maximum Coverage Area 75 sq ft Number of Speeds 1 Overall Depth 9 1 4 in Overall Height 5 3 4 in Overall Width 10 in