1300 CFM (cubic feet per minute) standard gable mount attic exhaust ventilator. Galvanized steel construction. Suitable for 1850 sq ft (square foot) attic. 2.6A (ampere) thermally protected 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 model No. CX2121-Automatic Gable Shutter. 2 year limited warranty on all parts. 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 - Nickel (Metallic)