1400 CFM (cubic feet per minute) standard roof mount attic exhaust ventilator. Galvanized steel construction base, Duradome spun aluminum dome. Suitable for 2000 sq ft (square foot) attic. 4.5A (ampere) thermally protected motor with built-in automatic -off. Includes 10A adjustable thermostat. Precision balanced aluminum fan blades for minimum vibration. 6-point suspensions (anchor points) for stability and high wind resistance. This fan requires minimum 600 sq in (square inch) net free area intake vent area. Suitable for up to 8/12 roof pitch. Includes galvanized steel mesh grill to protect against insects, birds, and rodents, yet allows adequate air intake. Easy installation with no special tools required. Mill finish. 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 - Lead