Ceiling Ventilator Discharge Direction Horizontal and Vertical Duct Diameter 4 in Duct Shape Round Housing Material Steel Heater Without Heater Includes Automatic Backdraft Damper Mounting Location Ceiling Maximum Airflow 93 cfm Exhaust Airflow @ 0.100 in SP 87 cfm Exhaust Airflow @ 0.000 in SP 97 cfm Maximum Noise Level 2.5 sones Noise Level @ 0.100 in SP @ 5 ft 4.1 sones Maximum Coverage Area 75 sq ft Number of Speeds Variable Overall Depth 8 in Overall Height 5 3/4 in