Attic Exhaust Fan Control Type Thermostat Blade Material Steel Exhaust Airflow @ 0.000 in SP 791 cfm Base Material Steel Fire Safety Shut-Off No High-Efficiency Motor Yes Housing Material Steel Includes Humidistat No Includes Shutter No Includes Thermostat Yes Maximum Attic Area 1 900 sq ft Motor Horsepower Not Applicable Mounting Location Roof Nameplate Voltage 120V AC Overall Diameter 14 1/2 in Overall Height 19 1/2 in Overall Length 23 1/2 in Overall Width 23 1/2 in