Attic Exhaust Fan, Control Type Humidistat, Thermostat, Blade Material Steel, Exhaust Airflow @ 0.000 in SP 1,500 cfm, Base Material Steel, Fire Safety Shut-Off No, High-Efficiency Motor No, Housing Material Steel, Includes Humidistat Yes, Includes Shutter No, Includes Thermostat Yes, Maximum Attic Area 2,100 sq ft, Motor Horsepower 1/6 hp, Mounting Location Roof, Nameplate Voltage 120V AC, Overall Height 8 in, Overall Length 24 in, Overall Width 24 in, Dome Shape Round WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov - Nickel (Metallic)