Ventamatic CX2500UPS Cool Attic 1650 CFM Energy Efficient Power Gable Mount Attic Vent Mount Ventilator with a 2.1 amp thermally protected PSC motor, a galvanized steel flange Easy to install behind automatic or static Gable Vents Attics up to 2,500 square feet Adjustable automatic thermostat Prolongs life of composition roof shingles with lower summer attic temperatures