Attic Exhaust Fan Control Type Smart Control Hub Blade Material Steel Exhaust Airflow @ 0.000 in SP 2 801 cfm Base Material Steel Fire Safety Shut-Off Yes High-Efficiency Motor Yes Housing Material Steel Includes Humidistat No Includes Shutter No Includes Thermostat Yes Maximum Attic Area 4 000 sq ft Motor Horsepower Not Applicable Mounting Location Gable Nameplate Voltage 120V AC Overall Diameter 16 1/2 in Overall Height 16 1/2 in Overall Length 16 1/2 in