Attic Exhaust Fan, Control Type Manual, Blade Material Aluminum, Exhaust Airflow @ 0.000 in SP 1,000 cfm, Base Material Galvanized Steel, Fire Safety Shut-Off No, High-Efficiency Motor Yes, Housing Material Steel, Includes Humidistat No, Includes Shutter No, Includes Thermostat No, Maximum Attic Area 1,550 sq ft, Motor Horsepower 1/10 hp, Mounting Location Gable, Nameplate Voltage 18V DC, Overall Diameter 15 in, Overall Height 5 3/4 in, Overall Length 15 in, Overall Width 51 in