Bath Exhaust Fan Discharge Direction Horizontal Duct Diameter 6 in Duct Shape Round Housing Finish Galvanized Housing Material Steel Heater Without Heater Includes Acoustic Insulation Grille Mounting Brackets Aluminum Backdraft Damper Mounting Location Ceiling Maximum Airflow 160 cfm Exhaust Airflow @ 0.100 in SP 156 cfm Exhaust Airflow @ 0.000 in SP 160 cfm Maximum Noise Level 5 sones Noise Level @ 0.100 in SP @ 5 ft 2.5 sones Number of Speeds 1 Overall Depth 13 7/8 in