1400 CFM (cubic feet per minute) superior energy efficient roof mount attic exhaust ventilator. Galvanized steel construction. Suitable for 2000 sq ft (square foot) attic. 2.1A (ampere) energy efficient thermally protected PSC (Permanent Split Capacitor) motor with built-in automatic cut-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. Lifetime limited warranty on all parts.