1400 cubic feet per minute standard roof mount attic exhaust ventilator. Galvanized steel construction base, Duradome spun aluminum dome. Suitable for 2000 square foot attic. 4.5-ampere thermally protected motor with built-in automatic cut-off. Includes 10-amp 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-square inch net free area intake vent area. Suitable for up to 8/12 roof pitch. 17-inch cut out diameter. 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.