Ventamatic Superior Energy Efficient Galvanized Gable Mount Attic Vent 1650 CFM cubic feet per minute superior energy efficient gable mount attic exhaust ventilator. Galvanized steel construction. Suitable for 2500 sq. ft. square foot attic. 2.1A ampere energy efficient thermally protected PSC Permanent Split Capacitor motor. Includes 10A adjustable thermostat. 14 fan blade. Engineered mounting system virtually eliminates vibration and ensures quiet operation. Precision balanced fan blades for minimum vibration and no heat distortion. 4 fan blades for greater air movement. This fan requires minimum 600 sq in square inch net free area intake vent area. Completely pre-assembled for easy installation, no special tools required. Easy installation behind static gable louvers or the model Rate 1650 cfm, Type Power, Material Galvanized Steel, Color Mill, For Use With 2500 sq. ft., Motor Size 2.1A, Rough Opening 15 Round, Pkg Qty 1, Package Type Box WARNING This product can expose you to chemicals including Chromium which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information visit www.P65Warnings.ca.gov