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 1 600 sq ft Motor Horsepower 1/10 hp Mounting Location Roof Nameplate Voltage 18V DC Overall Diameter 25 in Overall Height 9 in Overall Length 25 3/8 in Overall Width 25 3/8 in